People examine the workings of a plug-in hybrid electric vehicle (PHEV) at the low-carbon technology pavilion of the China International Green Industry Expo 2010 at Beijing Exhibition Center in Beijing, Nov 24, 2010. The expo, themed "green economy, mutual benefit," presents the latest high-tech achievements in energy conservation, clean energy utilization, environmental protection as well as recycling and development of low-carbon economy. It also offers a platform for communication and cooperation for enterprises from home and abroad. [Photo/Xinhua]