Volunteers play at the fountain in front of the National Natatorium bubbed as the "Water Cubic" in Beijing, China, July 29, 2008. The sky cleared after a rainfall in some areas of the capital Tuesday. (Xinhua Photo)

People play at the fountain in front of the National Aquatics Center, nicknamed the "Water Cube", in Beijing, China, July 29, 2008. The sky cleared after a rainfall in some areas of the capital Tuesday.(Xinhua Photo)

Fountain water dance in front of the National Aquatics Center, nicknamed the "Water Cube", in Beijing, China, July 29, 2008. The sky cleared after a rainfall in some areas of the capital Tuesday.(Xinhua Photo)

Fountain water spray in front of the National Stadium, nicknamed the "Bird's Nest", in Beijing, China, July 29, 2008. The sky cleared after a rainfall in some areas of the capital Tuesday.(Xinhua Photo)

A helicopter flies over the National Stadium, nicknamed the "Bird's Nest", in Beijing, China, July 29, 2008. The sky cleared after a rainfall in some areas of the capital Tuesday. (Xinhua Photo)

A worker arranges potted flower in front of the National Stadium, nicknamed the "Bird's Nest", in Beijing, China, July 29, 2008. The sky cleared after a rainfall in some areas of the capital Tuesday.(Xinhua Photo)

Editor: Yan