Actors of the opening ceremony walk outside the National Stadium, nicknamed the Bird's Nest, in Beijing, China, Aug. 5, 2008. A dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games was held on Tuesday. (Xinhua/Yang Lei)

Picture taken on Aug. 5, 2008 shows the fountain in front of the National Stadium, nicknamed the Bird's Nest, in Beijing, China. A dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games was held on Tuesday. (Xinhua/Chen Jianli)

A team of armed policemen patrol outside the National Stadium, nicknamed the Bird's Nest, in Beijing, China, Aug. 5, 2008. A dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games was held on Tuesday. (Xinhua/Chen Jianli)  

A staff member walks the National Stadium, nicknamed the Bird's Nest, before a dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games in Beijing, China, Aug. 5, 2008. (Xinhua/Li Ziheng) 

Some volunteers prepares for dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games at C3 gate of the National Stadium, nicknamed the Bird's Nest, in Beijing, China, Aug. 5, 2008. (Xinhua/Li Ziheng)  

Photo taken on Aug. 5, 2008 shows fences outside the National Stadium, nicknamed the Bird's Nest, before a dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games in Beijing, China. (Xinhua/Li Ziheng)

A volunteer guides spectators outside the National Stadium, nicknamed the Bird's Nest, in Beijing, China, Aug. 5, 2008. A dress rehearsal of the opening ceremony of Beijing 2008 Olympic Games was held on Tuesday. (Xinhua/Chen Jianli) 

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