Children participate in an outdoor physical training camp during summer vacation in Xinyu, east China's Jiangxi Province, July 12, 2018. (Xinhua/Zhao Chunliang)

Students of a local primary school compete in a friendly soccer match during summer vacation in Renhuai, southwest China's Guizhou Province, July 12, 2018. (Xinhua/Chen Yong)

Students of a local primary school compete in a friendly soccer match during summer vacation in Renhuai, southwest China's Guizhou Province, July 12, 2018. (Xinhua/Chen Yong)

Students of a local primary school attend a swimming class during summer vacation in Qionghai, south China's Hainan Province, July 12, 2018. (Xinhua/Meng Zhongde)

Students learn drawing during a class in Qinzhou City, south China's Guangxi Zhuang Autonomous Region, July 12, 2018. Students learn new skills during their summer vacation. (Xinhua/Zhang Ailin)

Students learn playing zither during a class in Qinzhou City, south China's Guangxi Zhuang Autonomous Region, July 12, 2018. Students learn new skills during their summer vacation. (Xinhua/Zhang Ailin)

Children practice dancing in the Fancheng District of Xiangyang City, central China's Hubei Province, July 4, 2018. Children participate in various activities during summer vacation. (Xinhua/Yang Dong)

Pupils learn robot programming at Zhongming Primary School in the Yi'an District of Tongling, east China's Anhui Province, July 4, 2018. Children participate in various activities during summer vacation. (Xinhua/Guo Shining)

A robot competition is held at Zhongming Primary School in the Yi'an District of Tongling, east China's Anhui Province, July 4, 2018. Children participate in various activities during summer vacation. (Xinhua/Guo Shining)