
Children show their painting works during an activity to celebrate the International Children's Day at a primary school in Zhangjiakou, north China's Hebei Province, June 1, 2017. (Xinhua/Guo Qiuda)

Children show their painting works during an activity to celebrate the International Children's Day at a primary school in Zhangjiakou, north China's Hebei Province, June 1, 2017. (Xinhua/Guo Qiuda)