Volunteer hostesses practice etiquette for the 26th World University Games in Shenzhen, South China's Guangdong province, July 30, 2011. Altogether, 350 people volunteered for the award ceremonies of the Universiade, including 290 women and 60 men. The 26th Summer Universiade, which will be held August 12-23, has 24 sports and 306 events. [Photo/Xinhua]

A boy sits on a floating sofa in a flooded street in Ninghe county, North China's Tianjin municipality, July 30, 2011. Downpours swept across the county overnight, with 119.7 mm of rain falling between 11 pm Friday to 9 am Saturday. Parts of the region have been threatened by rain-triggered floods. [Photo/Xinhua]