Students talk to teacher at Yifu primary school in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Zhou Hua)

Students engage in an activity at Yifu primary school in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Zhou Hua)

Students attend an opening ceremony at Binhulu primary school in Nanning, south China's Guangxi Zhuang Autonomous Region, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Huang Xiaobang)

Students engage in an activity at a school in Shanghai, east China, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Chen Fei)

(180903) -- GUANGZHOU, Sept. 3, 2018 (Xinhua) -- Students pay respects to teachers at a school in Guangzhou, south China's Guangdong Province, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Liu Dawei)

(180903) -- GUANGZHOU, Sept. 3, 2018 (Xinhua) -- Students engage in an activity at a school in Guangzhou, south China's Guangdong Province, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Liu Dawei)

Students engage in an activity to pay respects to teachers at a school in Shanghai, east China, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Chen Fei)

Students fly paper planes at a school in Shanghai, east China, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Fang Zhe)

A student beats a drum at a school in Shanghai, east China, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Chen Fei)

Students engage in an activity at a school in Shanghai, east China, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Chen Fei)

Students fly paper planes at a school in Qinhuangdao, north China's Hebei Province, Sept. 3, 2018. Schools all over the country prepare various activities for students to greet the new semester. (Xinhua/Cao Jianxiong)