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Poland's Grzegorz Sudol (L) competes with China's Si Tianfeng during men's 50km walk outside the National Stadium, also known as the Bird's Nest, during Beijing 2008 Olympic Games in Beijing, China, Aug. 22, 2008.[Liao Yujie/Xinhua]
![Poland's Grzegorz Sudol (L) competes with China's Si Tianfeng during men's 50km walk outside the National Stadium, also known as the Bird's Nest, during Beijing 2008 Olympic Games in Beijing, China, Aug. 22, 2008.[Liao Yujie/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20080822/0019b93bd68d0a18738f05.jpg "Poland's Grzegorz Sudol (L) competes with China's Si Tianfeng during men's 50km walk outside the National Stadium, also known as the Bird's Nest, during Beijing 2008 Olympic Games in Beijing, China, Aug. 22, 2008.[Liao Yujie/Xinhua]")