China's Liu Xiang falls during men's 110m hurdles heat at London 2012 Olympic Games, London, Britain, Aug. 7, 2012. Liu Xiang was disqualified for semifinal.(Xinhua/Chen Xiaowei)

　　China's Liu Xiang falls over during men's 110m hurdles heat at London 2012 Olympic Games, London, Britain, Aug. 7, 2012. Liu Xiang tumbled and was disqualified for semifinal.(Xinhua/Fan Jun)