Students have their faces scanned before entering Daowu middle school in Liuyang City of Changsha, capital of central China's Hunan Province, Aug. 31, 2020. The primary and middle schools in Changsha have started their new semester on Monday under strict COVID-19 control and prevention measures. (Xinhua/Chen Sihan)

A staff member disinfects table tennis facilities at Daowu middle school in Liuyang City of Changsha, capital of central China's Hunan Province, Aug. 31, 2020. The primary and middle schools in Changsha have started their new semester on Monday under strict COVID-19 control and prevention measures. (Xinhua/Chen Sihan)

Students attend a class at Daowu middle school in Liuyang City of Changsha, capital of central China's Hunan Province, Aug. 31, 2020. The primary and middle schools in Changsha have started their new semester on Monday under strict COVID-19 control and prevention measures. (Xinhua/Chen Sihan)

Students have their temperature measured at Daowu middle school in Liuyang City of Changsha, capital of central China's Hunan Province, Aug. 31, 2020. The primary and middle schools in Changsha have started their new semester on Monday under strict COVID-19 control and prevention measures. (Xinhua/Chen Sihan)

A student has her temperature measured before entering a classroom at Daowu middle school in Liuyang City of Changsha, capital of central China's Hunan Province, Aug. 31, 2020. The primary and middle schools in Changsha have started their new semester on Monday under strict COVID-19 control and prevention measures. (Xinhua/Chen Sihan)

Students queue up to enter Daowu middle school in Liuyang City of Changsha, capital of central China's Hunan Province, Aug. 31, 2020. The primary and middle schools in Changsha have started their new semester on Monday under strict COVID-19 control and prevention measures. (Xinhua/Chen Sihan)