The senior high third-graders walk into the No. 6 Middle School in Guiyang, southwest China's Guizhou Province, March 16, 2020. Students are required to enter the campus in staggered shifts as a way to reduce the risk of cross-infection. The third-graders of the junior and senior high schools returned to campuses for study in Guizhou Province on Monday. (Xinhua/Ou Dongqu)
