![(SP)BRITAIN-LONDON-ATHLETICS-IAAF-WORLD CHAMPIONSHIPS-DAY 4](http://www.xinhuanet.com//english/2017-08/08/136508715_15021764526201n.jpg)
Marcio Teles of Brazil falls down during Men's 400m Hurdles Semifinal on Day 4 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 7, 2017. (Xinhua/Wang Lili)
Marcio Teles of Brazil falls down during Men's 400m Hurdles Semifinal on Day 4 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 7, 2017. (Xinhua/Wang Lili)