Chinese women gymnasts attend training program in West Des Moines, U.S.

Liu Tingting, a member of China's women gymnastic team, is seen during training at 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)