
Usain Bolt (1st, L) of Jamaica competes during the men's 100 meters heat on Day One at the World Athletics Championships in London, Britain, on Aug. 4, 2017. (Xinhua/Han Yan)

Usain Bolt (1st, L) of Jamaica competes during the men's 100 meters heat on Day One at the World Athletics Championships in London, Britain, on Aug. 4, 2017. (Xinhua/Han Yan)