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Steven Gardiner of Bahamas competes during the men's 400m final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 4, 2019. (Xinhua/Li Ming)

Steven Gardiner of Bahamas competes during the men's 400m final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 4, 2019. (Xinhua/Li Ming)