Ruan Dong et al. ｜ Talent training in the 40 years of the Department of Physics of Tsinghua University

| Author: Ruan Dong Xiao Zhigang

(Department of Physics, Tsinghua University)

This article is selected from "Physics" No. 8, 2022

The Department of Physics of Tsinghua University was established in 1926 and is one of the earliest departments established by Tsinghua University. After the Southwest United University and the post -war recovery period, it was interrupted by the adjustment of the national department in 1952. In 1982, based on some teaching and research groups of the Physics Teaching and Research Group and the Department of Engineering, the Department of Physics was restored. The Department of Physics of Tsinghua University always uses talent training as the core mission and value inheritance of this department. The first department director, Mr. Ye Qisun, "only grants students with basic knowledge, heavy quality, no weight, theoretical and experimental emphasis", and has always played a vital guiding role in the practice of the cultivation of the topic of the physics department.

1 undergraduate training

In the 30 years from 1952 to 1982, although the Department of Physics did not exist, physical teaching was not interrupted. In the summer of 1952, Tsinghua University established the Physics Teaching and Research Group to undertake ordinary physics and experimental teaching of undergraduate students in the Department of Engineering. The Department of Physics was restored in 1982, including 7 teaching and research groups and 1 teaching laboratory. The Department of Physics is facing two major tasks in terms of talent training: one is to continue to provide high -quality physics teaching for students such as science and engineering and cultural and social sciences in the school, and the other is to cultivate excellent professional talents for physics.

In 1991, Tsinghua Physics was approved by the first batch of national science research and teaching talent training bases (referred to as science base). In 1997, the first batch was approved as a national engineering basic course teaching base (referred to as the engineering base). It is the only country in the country A unit with two bases of science and engineering at the same time. In the acceptance and evaluation of the bases organized by the Ministry of Education and the National Natural Science Foundation of China in 2004, Tsinghua's science and engineering and engineering department were all rated as "National Excellent Base". The establishment and construction of the two bases, as well as projects such as "211 Project" and "985 Project", have played a great role in promoting the quality of teaching, promoting the combination of science and engineering, promoting teaching reform and talent training.

The Tsinghua Physics Department took the lead in exploring a new model of undergraduate talent training in 1997 and carried out effective reform and innovation. In 1997, the basic science class was created. In 2009, the Tsinghua Academy Physical Class was established. After more than 20 years of exploration and practice, it has achieved remarkable results in teaching and training in basic disciplines, first -class talents and interdisciplinary talent training. In 2002 and 2010, the Tsinghua Physics Department conducted two international assessments respectively. The undergraduate teaching system and teaching quality of the Department of Physics were highly affirmed by international experts in the second evaluation. The quality of the raw is not inferior to the top universities in the United States. "The training model of the basic science class and the educating concept of the physics school class have already produced the talent training of Tsinghua University and the" tip plan "of the Ministry of Education. Active influence has played a leading and demonstration role in the cultivation of top -top talents in domestic universities.

1.1 Basic Physics Curriculum Teaching System

As a research -based comprehensive university, the basic physics course not only plays an important role in the training of talents in the Department of Physics, but also plays an irreplaceable role in the training of other sciences, engineering and cultural and social sciences in the school.

1.1.1 The establishment and development of the basic physics curriculum system

After the resumption, the teaching work of the general physics and physics department of public basic courses in the school is mainly borne by the basic physics teaching and research group. Basic courses of physics include four theoretical physics and research groups. The two teaching and research teams had a wealth of teaching experience before the resumption. After the resumption, the corresponding teaching content and teaching order was established.

After more than 10 years of exploration, the teaching positioning of basic physics courses was formed in 1995: strengthening the foundation, cultivating ability, improving quality, and highlighting innovation, and laying a physical foundation for the cultivation of research talents. Carry out teaching according to their aptitude. The curriculum is taught according to different levels and different needs, forming a basic teaching mode composed of teaching elements such as classroom lectures, demonstration experiments, and small classes discussions, and open research topics for students with good foundation.

In 2001, in order to give students more choices, college physics took the lead in proposing the "menu" model, and provided different varieties of "seven dishes": college physics A, university physics B, university physics (English), physical introduction, liberal arts physics, liberal arts physics , High -tech physics foundation, modern physics, for more than 2,400 science and science and science and science and science and science and science and science students. This "menu" model meets the needs of the talent training of the department and is welcomed by the department. At present, the department can "order" (including theoretical and experimental courses), and the physics department tailor the courses for them. In 2017, Tsinghua University began to enroll and cultivate in large categories. The Department of Physics further deepened the reform of classification in classification. Through the practice of recent years, teaching has achieved obvious results.

In 2001, the "modern reform of engineering physics teaching" won the second prize of national teaching achievements; in 2003, "university physics" was named "the first batch of national boutique courses"; State -level online first -class courses ", at the same time" university physics (1) (2) "was rated as" the first batch of national online and offline hybrid first -class courses "; in 2021," university physics "was rated as" Beijing university high -quality high -quality universities " Undergraduate course. In 2021, "University Physics (4th Edition)" won the "First National Excellent Textbook (Higher Education) Second Prize".

"University Physics (4th Edition)" was selected as the second national national excellent textbook (higher education) second prize in 2005. In the most important general physics courses of physics majors, the Department of Physics was conducted in the Department of Physics. Ordinary physics for students' free choice: (1) ordinary physics; (2) basic physics (English); (English); (3) basic physics principles and experiments; (4) Ferman physics. Ordinary physics and basic physics (English) are traditional types. The establishment of basic physics principles and experiments and Ferman Physics are a founding in China. At present, these two courses have become the main course of basic physics teaching. Basic physics principles and experiments (1) Elected to the "Tsinghua University benchmark course", Ferman Physics Course won the "First Prize of Beijing Higher Education Teaching Achievement Award" in 2022. In addition, the four major mechanics of important basic theory courses also starts in multiple levels, and the spring and autumn semester will be opened. Quantum mechanics was rated as "National Excellent Online Open Course" in 2017, in 2018 it was rated as one of the "first batch of 7 Tsinghua University benchmark courses", and in 2020, it was rated as "national first -class undergraduate course". In 2018, electrodynamics was rated as "National Online Open Course".

In order to coordinate the teaching and reform of various basic physics courses, in March 2018, the Department of Physics established a basic physics teaching center. The center takes a small number of backbone teachers as the core. The teaching and research series teachers of all research institutes and other departments can apply for the center. The center of the center holds a teaching seminar every semester. The joining of these teachers of these teaching and research series has injected new knowledge and different styles to the basic courses, and realized the length of teaching. At the same time Get exercise and growth.

1.1.2 The establishment and development of the physics experiment curriculum system

After the resumption, the Department of Physics has made great progress in experimental teaching, and is closely combined with the development of the discipline.

From 1982 to 1991, the Department of Physics established a complete, combined comprehensive college physics experimental teaching system to meet the needs of talent training in various departments. After 1992, during the implementation of the "211 Project" and "985 Project", as well as the implementation of science bases, engineering bases and other projects, experimental teaching reform and laboratory construction have embarked on the fast road, the teaching characteristics are more distinctive, and the quality of teaching has been further improved.

In 1997, the construction of the national engineering physics teaching base began. The construction of the laboratory emphasized the awareness of characteristics and boutique. In particular, it was necessary to carry forward the traditional and advantages, and to cultivate the experimental content with distinctive characteristics in combination with the generous engineering background of Tsinghua University.

In 1999, the talent training policy of "wide -caliber, thick foundation, strong experiment, and innovation" was clarified. The experimental physics teaching system also built the Nobel Prize Physical Laboratory and the Physical Electronic Laboratory. Curriculum construction positioning is: high starting point, multi -level, comprehensive, research and open. The content selection emphasizes the basic and physical nature of the experiment, but also pays attention to strengthening the cutting -edge and appliedness of the experiment; on the basis of ensuring basic training, emphasizes the cultivation of innovative consciousness and ability; focusing on teaching according to their aptitude, strengthening all science and engineering science science science in science and engineering science students While the cultivation of literacy and hands -on ability, focusing on the training of physical talents of tipping experiments, and providing development space for outstanding students. In the teaching method, emphasizing experimental research under the guidance of teachers, encouraging students to study, study in research, cultivate the spirit of exploration and innovation, and put the ideas of research teaching through experimental physics teaching at all levels.

In 1995, "Physics Experimental Tutorial: Modern Physics Experimental Section" and "Physics Experimental Tutorial: General Physics Experimental Section" won the first prize of outstanding textbooks for colleges and universities in the country. In 2005, the basic physical experiments facing science and engineering students were rated as national boutique courses. In 2007, the Experimental Physics Teaching Center was rated as the "National Experimental Teaching Demonstration Center". In 2017, the "Research Modern Physics Experimental Teaching of Free Experimental and Funtech" won the first prize of the Beijing Higher Education Teaching Achievement Award.

1.2 Undergraduate talent training

1.2.1 Three stages of talent training in the Department of Physics

After the restoration of 1982, 60 undergraduate students were recruited for the first time, and five years were enrolled. By 1987, the enrollment classes increased to 5 discipline directions, namely nuclear physics, solid physics, accelerators, modern physics, and theoretical physics, and the number of enrollment reached about 100.

Beginning in 1988, the Department of Physics has been enrolled with the major of applied physics, with more than 60 enrollment people each year. Among them, 1992 was an important point in time, and Tsinghua's underlying system changed from five years to four years.

Since 1999, the Department of Physics has enrolled in physics. Students can study related courses in the selected direction, do graduation thesis, and then apply for a graduation certificate for physics or application physics.

In 1991, the Ministry of Education established the "National Science Science Research and Teaching Talent Training Base", and the Tsinghua Physics Department was selected as the first batch of two bases in physics. In the two physics bases organized by the Ministry of Education and the National Natural Science Foundation of China in 1998 and 2004, Tsinghua Physics Base was rated as "excellent". In 2019, the first batch of physics majors was selected as a national first -class undergraduate construction point, and the application physics major was selected in 2022. 1.2.2 Exploration and practice of new models of first -class undergraduate talents

In 1997, the Department of Physics took the lead in exploring a new model of undergraduate first -class talent training, and carried out fruitful reform and innovation. In 1997, the basic science class (referred to as the basic science class) was established in 1997. class). After more than 20 years of exploration and practice, the training model of the Kenke class has now become the basic model of the training of talents in the physics department. The first -class talent training concept of the Physics School has been implemented, and all have achieved good results.

(1) Basic Science Class

At the end of 1997, the school decided to open a basic scientific class as a "test field" for teaching to explore the new model of the cultivation of top people. Admissions began in 1998. The basic subjects and physics majors enrolled two classes, with a total of about 120.

The training goals of the basic subject: cultivate top -top talents with innovative awareness and international competitiveness for basic disciplines such as physics and mathematics; and cultivate new types of research talents with good science literacy for other disciplines with high requirements for mathematics and physics. The guidelines for running schools in the basic class are: wide diameter, thick foundation, and strong practice.

The cultivation of the basic class emphasizes two aspects:

1) Consolidate mathematics and physical foundations. The course settings include 16 mathematics and physical main courses. Its credits account for nearly half of the total credits requirements of the course, and mathematics and physics have been placed in the same important position. It is possible for students to further develop in the direction of physics or mathematics, and they have certain advantages and characteristics; for those who think of other disciplines for further studies, a good mathematical foundation will also benefit them.

2) Carry out scientific research training. In the 5th, 6th, and 7th semester, a compulsory course "Special Research Course" (referred to as Seminar). Students choose the research direction according to their own aspirations, and choose the corresponding mentors inside and outside the school. Students study independently under the guidance of the instructor, independent research, and master the learning method of Mr. Yang Zhenning called "infiltration". Allow students to adjust their research directions and mentors independently. The unknown questionnaire survey showed that 95 % of students recognized for "Seminar's help and great help to themselves". Seminar does not emphasize the results of scientific research, but some students have achieved a batch of gratifying results in the research, including publishing papers in high -end professional journals, obtaining domestic and foreign patents, and reporting at domestic and foreign academic conferences.

Judging from the 20 -year statistics, the proportion of basic disciplines is nearly 60%, and the proportion of cross -crossing discipline is about 40%. The three disciplines with the highest proportion are: physics, computers and finance.

On June 2, 1999, Mr. Yang Zhenning took a group photo with the 8 -character seminar of the Bido Class

In the evaluation of the science base organized by the Ministry of Education in 1999, the expert group highly affirmed the basic science class model. In 2004, the "seven years of the basic science class has obvious results -the exploration and innovation of the top talent training model" won the first prize of the Beijing Education and Teaching Achievement Award (Higher Education).

(2) Tsinghua Academy Ye Enterprise Sun Physics Class

In April 2009, Tsinghua University launched the Tsinghua Academy Plan, and the Physical Class of Tsinghua Academy was established. In September of the same year, the Ministry of Education officially launched the "Basic Disciplinary Student Training Plan", and the Tsinghua Academy Plan is part of it. In July 2018, Tsinghua Academy Physical Class was renamed the Tsinghua Academy Ye Enterprise Sun Physics Class (referred to as Ye Qian Sun Class). In September 2018, the Ministry of Education issued the "Opinions on the Implementation of the Basic Disciplinary Student Training Plan 2.0" (referred to as "Top Specification Plan 2.0"), and Ye Enterprise Sun Ban's first batch of "Tip Plan 2.0" was selected in 2020.

Ye Qisen's class aims to cultivate a physicist with international first -class levels, and Academician Zhu Bangfen, the chief professor, put forward the concept of first -class physics talent training: (1) to strengthen the initiative of cultivating students, encourage students to take the initiative to learn, and actively study; (2) Basic research outstanding! Talents are not taught in the classroom, but to create a good "small environment" to "take out" the outstanding talents with potential; The greater the autonomous space; (4) "being" focuses on "learning", "adults" first to "talent", enhance students' sense of mission, inherit the spirit of "patriotic dedication, pursue excellence", and will have personal academic interests and The historical mission is combined. In addition, the implementation of a comprehensive mentor system (school mentor, academic mentor, academic mentor), and pay attention to guiding students' comprehensive growth. Pay special attention to cultivating students' curiosity, imagination, and critical thinking; cultivate students to form their own academic taste and lay the foundation for the formation of their future academic style.

Tsinghua Academy Ye Enterprise Physics Class students participated in the "Finding Dream of Southwest Union" physics camp (July 2021)

Statistics have a total of 211 students (2008 -Grade 2008 -2016), 96 students studying in China, accounting for 45%; 109 students studying abroad, accounting for 52%, of which the top university in the country (the top 6 in the United States ranks 6 , Two universities in the UK) more than half of the number of colleges; 86%of the proportion of further studies in the physical direction. Among the previous students, they have graduated or out of the post, and more than 10 people have worked in universities or research institutions at home and abroad, and many of them work in world -renowned universities. For example, there are 18 people in the first school physics class (graduated in 2012), and 9 of them are teaching in universities at home and abroad: Lianzhang, Shesen at Princeton University, Ye Linda at the California Institute of Technology, Zhang Xiaoxiao at Florida University, Gu Yingfei at Tsinghua University, Wang Lile at Peking University.

In 2018, "Stimipping Academic Interest Training Leading Talents:‘ Academy Plan ’Exploration and Practice Exploration and Practice” won the first prize of the National Teaching Achievement Award.

1.2.3 The effectiveness of undergraduate talent training

Since the resumption, the Department of Tsinghua Physics has trained a large number of undergraduates. They have done greatly in academic or industrial circles at home and abroad, and have become outstanding talents in all walks of life. At the beginning of the recovery, Zhao Zhiping, Wei Jie, Gao Haiyan, Dai Hongjie, Zhang Chaoyang, etc. During this period, some undergraduates went abroad through the Sino -US Joint Recruitment Physics Graduate Program (Cuspea). A large number of outstanding students who graduated in the past 10 years have stood out. Among them, Qi Xiaoliang, Xu Cenke, Chen Xi, Tian Yichao, Zheng Weizhen, Chen Huan, etc. have all become the leaders of the younger generation of the international academic circles. For example, Qi Xiaoliang and Chen Hong won the "New Vision Award of Physics" in 2016 and 2020; the "Sloan Research Award" with the reputation of the "Nobel Prize Wind Wind" in the United States and the most outstanding young talent in the science field, by 2022, 2022 In the year, 9 of the undergraduate graduates of the Department of Physics of Tsinghua Physics have won the "Sloan Research Award" of the Physics, and 9 other undergraduate graduates have obtained the "Slong in the field of neuroscience, molecular biology, mathematics, chemistry and other fields. The "research award", the above winners are leading among the School of Physics, the Academy of Physics, National University. A group of graduates have been in faculty in famous universities at home and abroad, and a group of graduates. For example, He Kaiming, who has become the top international scientist in the field of artificial intelligence visual recognition, has achieved world -renowned achievements in the high -tech field.

2 Graduate training

2.1 Graduate Training Overview

In the 1982 resumption department, the Department of Physics had two doctoral points. In 1989, the post -doctoral mobile station was established in physics. In 1998, he passed the review and became one of the first batch of five doctoral degree authorization points in the first batch of first -level disciplines in colleges and universities in the country. In 2001, the Ministry of Education carried out the selection of key disciplines across the country, and the three physical secondary disciplines (condensed physics, particle physics and nuclear physics and atomic molecules and optical physics) declared by the Department of Tsinghua Physics Subject". In 2002, the pilot work of the first physics international assessment was completed. In the past century, the Department of Physics of Tsinghua University has trained a large number of high -level talents for the country.

The scientific field of graduate training in the Department of Physics covers the direction of emerging disciplines such as condensation physics, atomic molecules and light physics, particle physics and nuclear physics, and quantum information. It is mainly academic innovative talents. All -round training such as basic theory and practical application. The employment industry of graduates is mainly based on academic studies, education or scientific research units, domestic key industries and leading enterprises and party and government agencies.

Since the recovery, the level of school running in physics has steadily improved. Especially in recent years, in recent years, it has actively played the role of demonstration of superior disciplines, deepened the reform of the talent system, continuously optimized the system and process of talent introduction. Talent, also cultivating independently, gradually establishes a high -level innovation team with a reasonable structure and appropriate volume, providing basic guarantee for graduate training with high levels of physics. Among the current teachers, there are more than 90 doctoral supervisors (including academicians), and about half of the young and middle -aged teachers of young and middle -aged and middle -aged and middle -aged and younger.

2020 Tsinghua University Physics Department of PhDs and Physics Exchange Conference and National Scholarship Defense Meeting

2.2 The main practice of graduate talent training

2.2.1 Learning Style Construction

In the process of graduate training, the Department of Physics organized and carried out diversified and high -level academic exchanges all year round, including the annual doctoral forum, inter -school doctoral exchanges, creating a department -level high -level academic seminar, holding top international conferences, etc. In addition, encourage and support students to organize various offline academic discussion activities by themselves.

The Department of Physics Inherits the characteristics of the red and special talents of Tsinghua University, and pays attention to cultivating students' sense of mission and family feelings. By building platforms such as various friends visits and social practice in key areas, and open graduate students' office communication time, support and carry out special collectives and party building activities, carry out lectures on the style of study and teach, and hold party group classes and co -construction activities, to create excellent academic style , Guide students to establish a consciousness of "standing ambition, on the big stage, and doing big things".

2.2.2 Graduate training quality guarantee system

In recent years, the Department of Tsinghua Physics has adhered to the country's demand for innovative academic talents, using academic research level as the core growth indicator of graduate students, and started to establish a teaching quality guarantee system that combines teaching promotion and quality control. Establish a sound teaching management system. As the executive agency of graduate teaching management and quality guarantee, the Graduate Training Commission, collectively controls doctoral enrollment, training, qualification review, curriculum construction and process management, discuss and promote graduate teaching reform matters, and provide quality guarantee for the training of graduate talents. (1) In the framework of the graduate training quality guarantee system, reform the enrollment selection system. After years of exploration, a relatively complete enrollment system has been established based on the principle of application -review and selection.

(2) Combined with the development of the training plan, planning and adjusting the discipline professional courses, further improvement of the curriculum system; reforming the curriculum and establishment mechanism, and improving the selection of basic theoretical courses and the quality of starting courses. At present, the Department of Physics has more than 30 graduate courses every year or open, including 3 school -level high -level courses.

(3) Strengthen the process management from the selection of topics, mid -term progress, and final academic reports; implement a doctoral qualification examination system, urge doctoral students to lay a good physical foundation, consolidate the quality The actual needs of the mentor, reasonably guide students' research aspirations, and promote the healthy interaction between the two sides in the teaching and academic links.

(4) Reform the evaluation system of the innovation results of graduate students, correct the tendency of the argument in the degree evaluation, and formulate a series of stricter intermediate process evaluation systems at the same time; revise the anonymous assessment mechanism based on anonymous review opinions, and strictly implement the full anonymity of doctoral dissertations. Evaluation, strict work for the confidentiality of the information of the trial.

2.2.3 Scientific research training and teaching training

In the practice of the cultivation of graduate talents, the Department of Physics encourages students to encourage students with major international or national needs related to physics under the guidance of mentors, refine important scientific issues, engage in high -level cutting -edge basic research and basic application research, support the instructor group Cultivate model, broaden the academic horizons of graduate students, and provide comprehensive training for students' academic growth; establish a comprehensive teaching assistant system, support and require students to serve as a certain number of experimental courses, basic theoretical courses or professional courses. Improve the communication and interaction of mentors and students, promote students' good teaching practice, and improve teaching skills.

2.2.4 International exchanges and cooperation

Teachers' teams participated in the construction, upgrading and physical analysis of multiple large -scale international cooperation experiments, and made full use of large -scale scientific projects at home and abroad to engage in innovative research. Correspondingly, the Department of Physics also raised resources through various parties to encourage and support graduate students to actively participate in international cooperation and academic exchanges, in -depth understanding of the cutting -edge progress of research in the field of discipline, open up an international perspective, and further improve the level of academic literacy and research.

2.3 The achievement of graduate talent training

At the beginning of the repetition, the graduate training of the Department of Physics was based on academic master's degree, and selected the best to cultivate academic doctoral talents. Over the past 40 years, the Department of Physics has continuously optimized and adjusted the training goals in conjunction with the characteristics of the discipline and development laws, and formed a graduate training system with academic doctoral training under the two first -level disciplines of the current physics and astronomy.

In the past 40 years of resumption, graduate training in the Department of Physics has achieved excellent results. A total of more than 700 masters and more than 600 doctoral students successfully completed their studies and obtained their degrees. Graduates who are active in academic platforms at home and abroad have achieved a series of major results in different research fields. Among the graduates of the 40th anniversary of the resumption, 4 academicians of the Chinese Academy of Sciences, an academician of the Chinese Academy of Engineering, and an academician of the National Academy of Sciences. According to incomplete statistics, 125 graduates and more than 200 doctoral graduates continued to engage in academic research in universities and scientific research institutes at home and abroad. Scholars, Miller scholars, and various high -level international awards such as the "Outstanding Young Scientists Award" and "Asian Achievement Award" issued by the Society of Chinese and Global Chinese and Physics and Astronomical Society.

3 conclusion

This article introduces the development and status quo of undergraduate and graduate talents in the 40 years of the Department of Physics of Tsinghua Physics. It shares the concept of educating people and the results of teaching reform summarized by the Department of Physics in the past 20 years. Learn. Due to the limited space, some details have not been expanded, and there are some factors related to themes that do not include in, especially the teacher -student evaluation system, teacher team building, physics culture and academic atmosphere. In addition to the curriculum system and advanced training model, human factors are also critical. The Tsinghua Physics Department has achieved so many teaching and educating results in the 40 years of resumption. Achievement.

For the 40 years of the Department of Physics of Tsinghua University, it has been taking the Lidu people as the core task, reforming and innovation, and fighting for the first time.At present, the country's demand for innovative talents is urgent than ever before. The Tsinghua Physics Department will inherit the excellent historical tradition and advanced talent training concept, further deepen the reform of education and teaching, and continue to improve the quality of talent training, especially the quality of graduate talent training.The country is rich and strong, and the national rejuvenation contributes a force.references

[1] Zhu Bangfen. Tsinghua Physics 80 Years. Beijing: Tsinghua University Press, 2006

[2] Ruan Dong. Physics and Engineering, 2020, 30 (1): 3

[3] Ruan Dong, Shang Rencheng, Xiong Jiajiong, etc., physics and engineering, 2020, 30 (1): 10

[4] Zhu Bangfen. Physics and Engineering, 2018, 28 (5): 5

[5] Li Shiqun, Zhu Bangfen. Physics and Engineering, 2018, 28 (6): 3

[6] Ruan Dong, Wang Qing, Xu Zhan. Physics and Engineering, 2018, 28 (6): 15

[7] Ruan Dong. University Physics, 2018, 37 (5): 7

[8] Wang Qing. Physics and Engineering, 2018, 28 (4): 20

(The article is reproduced from the journal network of the Chinese Institute of Physics, the author is Ruan Dong and Xiao Zhigang.)

- END -