
Pupils learn gestures of traffic police during an activity held to celebrate the upcoming International Children's Day in Zhangjiajie City, central China's Hunan Province, May 31, 2017. (Xinhua/Wu Yongbing)

Pupils learn gestures of traffic police during an activity held to celebrate the upcoming International Children's Day in Zhangjiajie City, central China's Hunan Province, May 31, 2017. (Xinhua/Wu Yongbing)