Students wearing face shields and face masks attend a class at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic. (Photos: Xinhua)

A medical worker checks the body temperature of a student at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic.

Students wearing face shields and face masks attend a class at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic.

Students wearing face shields and face masks attend a class at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic.

A medical worker checks the body temperature of a student at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic.

Students wearing face shields and face masks attend a class at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic.

A medical worker examines the health condition of a student at a school in Kathmandu, Nepal, Dec. 11, 2020. Schools in various municipalities of Kathmandu reopened recently after months of closure due to the COVID-19 pandemic.