Students play games during a class break at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

Students play games during a class break at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

Students attend a class at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Fang Xin)

Students attend a class at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

Students salute during a flag-raising ceremony at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Fang Xin)

A flag-raising ceremony is held at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

Students attend a class at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

A teacher gives a psychological counseling class at a temporary classroom inside a tent in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

Students attend a psychological counseling class at a temporary classroom inside a tent in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)

A teacher instructs a student at a primary school in Liugou Township of Jishishan County, northwest China's Gansu Province, Dec. 25, 2023. Primary and secondary schools in the quake-hit areas of Jishishan started to resume classes on Monday after a safety check. (Xinhua/Chen Bin)