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Liu Xiang of China is seen before the women's 50m freestyle semifinal at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Bai Xuefei)

Liu Xiang of China is seen before the women's 50m freestyle semifinal at FINA World Championships in Gwangju, South Korea, on July 27, 2019. (Xinhua/Bai Xuefei)