A teacher trains pupils to play basketball at a primary school in Hanshan District in Handan City, north China's Hebei Province, July 9, 2019. A series of activities were held by the educational authorities of Hanshan District to enrich the life of children during the summer vacation. (Xinhua/Wang Xiao)

A pupil assembles a robot at a primary school in Hanshan District in Handan City, north China's Hebei Province, July 9, 2019. A series of activities were held by the educational authorities of Hanshan District to enrich the life of children during the summer vacation. (Xinhua/Wang Xiao)

A pupil practices Guzheng, or Chinese zither, at a primary school in Hanshan District in Handan City, north China's Hebei Province, July 9, 2019. A series of activities were held by the educational authorities of Hanshan District to enrich the life of children during the summer vacation. (Xinhua/Wang Xiao)

A teacher introduces the structure of a robot to pupils at a primary school in Hanshan District in Handan City, north China's Hebei Province, July 9, 2019. A series of activities were held by the educational authorities of Hanshan District to enrich the life of children during the summer vacation. (Xinhua/Wang Xiao)

A teacher instructs a pupil to paint at a primary school in Hanshan District in Handan City, north China's Hebei Province, July 9, 2019. A series of activities were held by the educational authorities of Hanshan District to enrich the life of children during the summer vacation. (Xinhua/Wang Xiao)