A worker is busy at a construction site of an underground power house in Three Gorges Dam in Yichang, Central China's Hubei province, Jan 30, 2011. [Photo/Xinhua]

Children take pictures in front of the China Pavilion at 2010 Shanghai Expo site in Shanghai, Jan 30, 2011. During the long holiday from the Chinese New Year's Eve (Feb 2) to Feb 8, the China Pavilion will be open to the public. [Photo/Xinhua]