The line to reopen schools in China is very high because the safety of kids is prior to anything. First, my city has ZERO case for 100 days before reopening schools. All schools get full aid from local government to have plenty of surgical masks, gloves, gowns, alcohol, disinfectants, infrared thermometers, liquid hand soap, sanitizers, etc. for staff and students. 

Before reopening, every school had made a very detailed plan for it and had been preparing and drilling for one month. Local government and DOE (Department of Education) checked each school to guarantee every procedure is safe enough. Every student and school staff had been reporting their health condition and their contact every day for 30 days. A health declaration form must be filled and signed daily. Only the students who are proved to be healthy can return. If anyone including parents goes out of the city, he must report to school and have self-quarantine for 14 days. All the school staff has taken nucleic acid testing. None of them is positive or has anti-body.

On the whole, the key points are testing, wearing masks, washing hands carefully, comprehensive disinfection, social distancing, natural ventilation, no gathering and contact tracing. Everyone is involved in this pandemic, so it is our responsibility to be diligent and vigilant to keep ourselves and others safe.