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Yu Hexin (L)of China talks with another contestant after men's 50m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Yu won the gold medal. (Xinhua/Ding Ting)

Yu Hexin (L)of China talks with another contestant after men's 50m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 21, 2018. Yu won the gold medal. (Xinhua/Ding Ting)