Suspects involved in serious crimes of violence against Chinese citizens in Angola are escorted to get off the plane after arriving in Beijing on Aug 25, 2012. [Photo/Xinhua]

Workers relax briefly at the commencement ceremony of the sewage treatment plant in Yongxing Island on Saturday. [Photo/Xinhua]

Aircraft perform manoeuvres during the opening day of "AOPA-China Fly-In 2012" in Shenyang, Liaoning province, August 25, 2012.The event organized by the Aircraft Owners and Pilots Association of China (AOPA China), will last for 3 days, local media reported. [Photo/Agencies]