China's Ning Zetao reacts after the men's 100m freestyle heat of swimming at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 9, 2016.(Xinhua/Ding Xu)
China's Ning Zetao reacts after the men's 100m freestyle heat of swimming at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 9, 2016.(Xinhua/Ding Xu)