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Su Bingtian of China reacts during the men's 100m semifinal at the 2019 IAAF World Athletics Championships in Doha, Qatar, Sept. 28, 2019. (Xinhua/Wang Jingqiang)

Su Bingtian of China reacts during the men's 100m semifinal at the 2019 IAAF World Athletics Championships in Doha, Qatar, Sept. 28, 2019. (Xinhua/Wang Jingqiang)