Students are in class at a middle school in Taiyuan, north China's Shanxi Province, April 25, 2020. Students in their final year of junior high school returned to school in Taiyuan on Saturday. [Photo/Xinhua]

A teacher gives a lecture on epidemic prevention to students at a middle school in Taiyuan, north China's Shanxi Province, April 25, 2020. Students in their final year of junior high school returned to school in Taiyuan on Saturday. [Photo/Xinhua]

A student gets her hands disinfected before entering the classroom at a middle school in Taiyuan, north China's Shanxi Province, April 25, 2020. Students in their final year of junior high school returned to school in Taiyuan on Saturday. [Photo/Xinhua]

A student gets his body temperature checked before entering the campus at a middle school in Taiyuan, north China's Shanxi Province, April 25, 2020. Students in their final year of junior high school returned to school in Taiyuan on Saturday. [Photo/Xinhua]

A teacher leads students into their classrooms in an orderly way at a middle school in Taiyuan, north China's Shanxi Province, April 25, 2020. Students in their final year of junior high school returned to school in Taiyuan on Saturday. [Photo/Xinhua]

A student gets his hands disinfected after entering the campus at a middle school in Taiyuan, north China's Shanxi Province, April 25, 2020. Students in their final year of junior high school returned to school in Taiyuan on Saturday. [Photo/Xinhua]