Parents and children take part in an activity to greet the International Children's Day at Suoxi Central Kindergarten in Zhangjiajie City, central China's Hunan Province, May 23, 2018. (Xinhua/Wu Yongbing)

Parents and children take part in an activity to greet the International Children's Day at Suoxi Central Kindergarten in Zhangjiajie City, central China's Hunan Province, May 23, 2018. (Xinhua/Wu Yongbing)

Parents and children take part in an activity to greet the International Children's Day at Suoxi Central Kindergarten in Zhangjiajie City, central China's Hunan Province, May 23, 2018. (Xinhua/Wu Yongbing)

Parents and children take part in an activity to greet the International Children's Day at Suoxi Central Kindergarten in Zhangjiajie City, central China's Hunan Province, May 23, 2018. (Xinhua/Wu Yongbing)