Tibetan girls perform on horses during a horse race festival in Damxung county of Lhasa, Southwest China's Tibet autonomous region August 19, 2011. The seven-day horse race festival, with the history of more than 300 years, is held in Damxung in August each year. [Photo/Agencies]

A woman cools down in the hot weather at a swimming pool near the Bund of the Huangpu River, in Shanghai August 19, 2011. [Photo/Agencies]