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Su Bingtian (C) of China competes during the men's 100m semi-final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 28, 2019. (Xinhua/Li Gang)

Su Bingtian (C) of China competes during the men's 100m semi-final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 28, 2019. (Xinhua/Li Gang)