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Li Zhuhao of China gets ready before the men's 200m butterfly preliminary at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 23, 2019. (Xinhua/Tao Xiyi)

Li Zhuhao of China gets ready before the men's 200m butterfly preliminary at the Gwangju 2019 FINA World Championships in Gwangju, South Korea, July 23, 2019. (Xinhua/Tao Xiyi)