Teachers and students have meals at a canteen in the Shanghai Jiao Tong University, east China's Shanghai Municipality, Feb. 2, 2021. About 2,000 students of Shanghai Jiao Tong University chose to stay on the campus during this winter holiday, nearly 10 times the number of previous years, and most of them are postgraduates.(Xinhua/Liu Ying)

Teachers and students do experiments at a laboratory in the Shanghai Jiao Tong University, east China's Shanghai Municipality, Feb. 2, 2021. About 2,000 students of Shanghai Jiao Tong University chose to stay on the campus during this winter holiday, nearly 10 times the number of previous years, and most of them are postgraduates.(Xinhua/Liu Ying)

Fang Xiaoyong, a graduate student from Hebei Province in north China, does an experiment at the laboratory in the Shanghai Jiao Tong University, east China's Shanghai Municipality, Feb. 2, 2021.(Xinhua/Liu Ying)

Wu Zhihao, a undergraduate student from Xinjiang Uygur Autonomous Region in northwest China, works at the student service center in the Shanghai Jiao Tong University, east China's Shanghai Municipality, Feb. 2, 2021.(Xinhua/Liu Ying)

Zhao Linchuan (R), a doctoral candidate from Liaoning in northeast China, plays table tennis with her classmates in the Shanghai Jiao Tong University, east China's Shanghai Municipality, Feb. 2, 2021.(Xinhua/Liu Ying)

A staff member displays meal coupons for students who stay on campus for the Chinese Lunar New Year at the Shanghai Jiao Tong University, east China's Shanghai Municipality, Feb. 2, 2021.(Xinhua/Liu Ying)