Students on the third grade of the junior section of the High School Affiliated to China Agricultural University receive instructions on COVID-19 prevention and control before leaving campus in Beijing, capital of China, Jan. 21, 2021. All primary schools in Beijing have been on winter vacation since Jan. 16. Classes on the first and second grades of junior sections of high schools here are slated to start their winter vacations as of Jan. 23. Classes on all other grades of high schools are expected to complete their off-line academic activities by Jan. 23, and all students on these classes will no longer attend on-campus activities as of the same date. (Xinhua/Ren Chao)