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. [Photo/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. [Photo/Xinhua]

Children make clay sculptures to greet the International Children's Day in Cangzhou, North China's Hebei province, May 30, 2019. [Photo/Xinhua]

Children make clay sculptures to greet the International Children's Day in Cangzhou, North China's Hebei province, May 30, 2019. [Photo/Xinhua]

Children perform during an activity to greet the International Children's Day in Shijiazhuang, capital of North China's Hebei province, May 30, 2019. [Photo/Xinhua]

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. [Photo/Xinhua]

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. [Photo/Xinhua]

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. [Photo/Xinhua]

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. [Photo/Xinhua]

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. [Photo/Xinhua]

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. [Photo/Xinhua]