Usain Bolt of Jamaica starts during the men's 100m final at the 2015 IAAF World Championships in Beijing, capital of China, on Aug. 23, 2015. (Photo: Xinhua/Li Wen)
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Usain Bolt of Jamaica starts during the men's 100m final at the 2015 IAAF World Championships in Beijing, capital of China, on Aug. 23, 2015. (Photo: Xinhua/Li Wen)
