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Athletes competes during men's 50km walk at the National Stadium, also known as the Bird's Nest, during Beijing 2008 Olympic Games in Beijing, China, Aug. 22, 2008. [Guo Dayue/Xinhua]
![Athletes competes during men's 50km walk at the National Stadium, also known as the Bird's Nest, during Beijing 2008 Olympic Games in Beijing, China, Aug. 22, 2008. [Guo Dayue/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20080822/0019b93bd68d0a18725201.jpg "Athletes competes during men's 50km walk at the National Stadium, also known as the Bird's Nest, during Beijing 2008 Olympic Games in Beijing, China, Aug. 22, 2008. [Guo Dayue/Xinhua]")