China's Ning Zetao reacts after a men's 50m freestyle heat of swimming at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 11, 2016. (Xinhua/Ding Xu)
China's Ning Zetao reacts after a men's 50m freestyle heat of swimming at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 11, 2016. (Xinhua/Ding Xu)