Fu Yuanhui of China gestures after the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)

　　Fu Yuanhui of China competes during the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)

　　Fu Yuanhui of China competes during the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)

　　Fu Yuanhui of China gestures after the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)

　　Fu Yuanhui of China competes during the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)

　　Fu Yuanhui of China reacts after the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)

　　Fu Yuanhui of China waves after the women's 50m backstroke heats at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province on Dec. 14, 2018. (Xinhua/Wang Lili)