Staff members disinfect a classroom of the High School Affiliated to Beihang University on April 24, 2020. Beijing students in their final year of senior high school are expected to return to school on April 27. (Photos: People's Daily online;compiled by Shi Kaidi)

A staff member disinfects the surface of objects in the classroom on April 24, 2020.

To prepare for the upcoming school opening, staff members disinfect the corridor of the teaching building on April 24, 2020.

A staff member collects air samples in the classroom to measure the content of bacteria on April 24, 2020.

To prepare for the upcoming school opening, staff members disinfect the surface of objects in the classroom on April 24, 2020.

To prepare for the upcoming school opening, staff members disinfect the corridor of the teaching building on April 24, 2020.