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Yu Hexin of China enters the aquatic center before men's 100m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 23, 2018. (Xinhua/Pan Yulong)

Yu Hexin of China enters the aquatic center before men's 100m freestyle final of swimming at the 18th Asian Games in Jakarta, Indonesia, Aug. 23, 2018. (Xinhua/Pan Yulong)