Students learn first aid skills at a primary school of Hanshan District in Handan, north China's Hebei Province, May 28, 2019. Various events are held in celebration of the upcoming International Children's Day. (Xinhua/Wang Hongchao)

Children interact with robot toys during a Children's Day theme event at Matou Community in Sanjiang Township of Jinping County in Miao-Dong Autonomous Prefecture of Qiandongnan, southwest China's Guizhou Province, May 28, 2019. Various events are held in celebration of the upcoming International Children's Day. (Xinhua/Peng Zeliang)

Primary school pupils paint wooden ladle (mashao) masks during a Children's Day theme activity in Jinan, capital of east China's Shandong Province, May 28, 2019. Various events are held in celebration of the upcoming International Children's Day. (Xinhua/Zhao Xiaoming)

Children learn waste sorting knowledge during a Children's Day theme event at Matou Community in Sanjiang Township of Jinping County in Miao-Dong Autonomous Prefecture of Qiandongnan, southwest China's Guizhou Province, May 28, 2019. Various events are held in celebration of the upcoming International Children's Day. (Xinhua/Peng Zeliang)

Primary school pupils play pitch-pot, or Touhu game, an ancient entertainment that requires players to throw sticks from a set distance into a canister, in Zunhua City, north China's Hebei Province, May 28, 2019. Various events are held in celebration of the upcoming International Children's Day. (Xinhua/Liu Mancang)