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Yan Siyu competes in the preliminary match of the women's 800m freestyle during China's National Swimming Championships in Qingdao, east China's Shandong Province, March 29, 2019. (Xinhua/Li Ziheng)

Yan Siyu competes in the preliminary match of the women's 800m freestyle during China's National Swimming Championships in Qingdao, east China's Shandong Province, March 29, 2019. (Xinhua/Li Ziheng)