Robots dance during the opening ceremony of the 2011 China Robot Competition in Lanzhou, capital of Northwest China's Gansu province, August 23, 2011. Nearly 1,000 teams from 162 colleges and universities in China took part in the competition. [Photo/Xinhua]

A woman washes clothes in an almost-dry reservoir in Zhaotong, Yunnan province, on August 23, 2011. Low precipitation caused a seven-month drought in Zhaotong, and more than 4 million mu (2,667 square kilometers) of crops failed due to the drought. [Photo/Xinhua]