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Xu Jiayu (L) of China and Irie Ryosuke of Japan celebrate after winning the men's 100m backstroke final at FINA Championships Swim Series 2020 in Beijing, capital of China, Jan. 18, 2020. (Xinhua/Ju Huanzong)

Xu Jiayu (L) of China and Irie Ryosuke of Japan celebrate after winning the men's 100m backstroke final at FINA Championships Swim Series 2020 in Beijing, capital of China, Jan. 18, 2020. (Xinhua/Ju Huanzong)