Ryan Held (C) of Team USA congratulates his teammate Kelsi Dahlia (down) after winning Mixed 4x50m Freestyle Final at 14th FINA World Swimming Championships (25m) in Hangzhou, east China's Zhejiang Province, on Dec. 12, 2018. Team USA claimed the title with a new World Record of 1:27.89. (Xinhua/Wang Lili)