
Usain Bolt of Jamaica reacts in front of the timer displaying his two world records on Day 10 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 13, 2017. (Xinhua/Han Yan)

Usain Bolt of Jamaica reacts in front of the timer displaying his two world records on Day 10 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 13, 2017. (Xinhua/Han Yan)