Students dance during an activity to greet the upcoming International Children's Day at the Central Primary School in Fengshan Township of Shijiazhuang, capital of north China's Hebei Province, May 30, 2019. (Xinhua/Zhang Xiuke)

Children participate in an obstacle race with a family member during a competition in celebration of the upcoming International Children's Day at Baowei Kindergarten in Yantai City, east China's Shandong Province, May 30, 2019. (Xinhua/Sun Wentan)

Students sing during an activity to greet the upcoming International Children's Day at Yiping Primary School in Luohe City, central China's Henan Province, May 30, 2019. (Xinhua/Feng Dapeng)

Students race model cars during an activity to greet the upcoming International Children's Day at a primary school in Fuzhou, capital of southeast China's Fujian Province, May 30, 2019. (Xinhua/Song Weiwei)

A child participates in an obstacle race during a competition in celebration of the upcoming International Children's Day at Baowei Kindergarten in Yantai City, east China's Shandong Province, May 30, 2019. (Xinhua/Sun Wentan)

A foreign college student plays with pupils during an activity in celebration of the upcoming International Children's Day at a primary school in Xiexi Village of Tianxin Township in Shanggao County in Yichun City, east China's Jiangxi Province, May 29, 2019. (Xinhua/Zhou Liang)

Students listen to war stories during an activity in celebration of the upcoming International Children's Day at Fucheng County, north China's Hebei Province, May 30, 2019. (Xinhua/Li Xiaoguo)

Students paint during an activity to greet the upcoming International Children's Day at a primary school in Fuzhou, capital of southeast China's Fujian Province, May 30, 2019. (Xinhua/Song Weiwei)

Children perform with basketballs during an event in celebration of the upcoming International Children's Day at a kindergarten in Lianyungang City, east China's Jiangsu Province, May 30, 2019. (Xinhua/Si Wei)

Students perform dance during an event in celebration of the upcoming International Children's Day at Nanguan Primary School in Zhangye, northwest China's Gansu Province, May 30, 2019. (Xinhua/Wang Jiang)

Students view an exhibit during an event in celebration of the upcoming International Children's Day in Longhui County, Shaoyang City, central China's Hunan Province, May 30, 2019. (Xinhua/Zeng Yong)