Li Shenghui, a guard at the World Expo Park, stands in the sun outside the UK Pavilion in Shanghai, east China, Aug. 3, 2010. The highest temperature exceeded 39 degrees Centigrade in Shanghai Tuesday. [Xinhua]

Tourists enjoy themselves in the World Expo Park in Shanghai, east China, Aug. 3, 2010. More than 300 thousands tourists came to visit the World Expo Park as the highest temperature exceeded 39 degrees Centigrade in Shanghai Tuesday. [Xinhua]