A girl plays in front of a mirror in the Inner Mongolia Science and Technology Museum in Hohhot, north China's Inner Mongolia Autonomous Region, July 27, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Ding Genhou)

Children learn Peking opera in Xichang primary school in Chengdong Township of Nantong, east China's Jiangsu Province, July 28, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Xu Jinbai)

Children learn swimming in Xuan'en County, central China's Hubei Province, July 28, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Song Wen)

A girl walks through a corridor in Inner Mongolia Science and Technology Museum in Hohhot, north China's Inner Mongolia Autonomous Region, July 27, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Ding Genhou)

Children practice basketball in front of a gym in Longnan City, northwest China's Gansu Province, July 28, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Ran Chuangchang)

Children learn Peking opera in Xichang primary school in Chengdong Township of Nantong, east China's Jiangsu Province, July 28, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Xu Jinbai)