Children paint on playground to greet the International Children's Day in Jingning She Autonomous County, Lishui City of east China's Zhejiang Province, May 29, 2019. (Photos: Xinhua)

Children of a special education school paint during an activity to greet the International Children's Day in Zunhua City, Tangshan of north China's Hebei Province, May 30, 2019.

Children make clay sculptures to greet the International Children's Day in Cangzhou, north China's Hebei Province, May 30, 2019.

Children perform during an activity to greet the International Children's Day in Shijiazhuang, capital of north China's Hebei Province, May 30, 2019.

Bookmarks made by children are displayed during an activity to greet the International Children's Day in a kindergarten in Qianxi County, Tangshan City of north China's Hebei Province, May 30, 2019.

Children take part in an activity to greet the International Children's Day in a kindergarten in Qianxi County, Tangshan City of north China's Hebei Province, May 30, 2019.

A child and his mother watch models during an activity to greet the International Children's Day in Qingdao, east China's Shandong Province, May 30, 2019.

Children perform during an activity to greet the International Children's Day in Yiyuan County, Zibo City, east China's Shandong Province, May 30, 2019.

A little Wu Opera actress interacts with classmate during an activity to greet the International Children's Day in Jiande City, east China's Zhejiang Province, May 30, 2019.