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Liu Yaxin of China competes during the women's 200m backstroke preliminary at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 26, 2019. (Xinhua/Tao Xiyi)

Liu Yaxin of China competes during the women's 200m backstroke preliminary at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 26, 2019. (Xinhua/Tao Xiyi)