Children perform Lusheng dance during an event in celebration of the upcoming International Children's Day at a kindergarten in Longli County, Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 31, 2019. (Xinhua/Long Yi)

A child takes part in a watergun battle during an event in celebration of the upcoming International Children's Day at a kindergarten in Shushan District of Hefei City, capital of east China's Anhui Province, May 31, 2019. (Xinhua/Chen Sanhu)

A girl does basketball exercises during an event in celebration of the upcoming International Children's Day at a kindergarten in Zigui County of Yichang City, central China's Hubei Province, May 31, 2019. (Xinhua/Wang Gang)

Children play glass balls during an event in celebration of the upcoming International Children's Day at an elementary school in Feixiang District of Handan City, north China's Hebei Province, May 31, 2019. (Xinhua/Hu Gaolei)

Children play games with parents during an event in celebration of the upcoming International Children's Day at a kindergarten in Longli County, Bouyei-Miao Autonomous Prefecture of Qiannan, southwest China's Guizhou Province, May 31, 2019. (Xinhua/Long Yi)