Liu Xiang of China grimaces in pain during his warm-up before the start of his 110m hurdles heat of the athletics competition in the National Stadium at the Beijing 2008 Olympic Games August 18, 2008.

• 2008年8月18日北京奥运会国家体育场，田径类110米栏项目预赛开始前，中国选手刘翔热身时流露出痛苦的表情。