Students wearing face masks sit in classroom at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. Wuhan resumed classes for first- and second-grade students at middle schools from Aug 10. [Photo by Wu Xiaohui/chinadaily.com.cn]

Students salute the national flag during a ceremony at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Wu Xiaohui/chinadaily.com.cn]

A teacher takes class at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Wu Xiaohui/chinadaily.com.cn]

A student answers questions at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Wu Xiaohui/chinadaily.com.cn]

A teacher takes class at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Zhao Jun/chinadaily.com.cn]

Students wash their hands before entering classrooms at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Zhao Jun/chinadaily.com.cn]

Students pass the face recognition system before entering classrooms at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Zhao Jun/chinadaily.com.cn]

Students enter the campus at Hubei Shuiguohu No 1 Middle School in Wuhan, Central China's Hubei province, on Aug 10, 2020. [Photo by Zhao Jun/chinadaily.com.cn]