Liu Tingting (L) and Chen Yile(C), members of China's women gymnastic team, are seen during training with Qiao Liang, head coach of Chow's Gymnastics and Dance Institute, in West Des Moines, Iowa, the United States, on Dec. 27, 2017. Four Chinese women gymnasts have been attending a 20-day training program since Dec. 11. (Xinhua/Yin Bogu)