A CH-4 unmanned aerial vehicle (UAV), characterized by its long battery life of 40 hours, is displayed at the 10th China International Aviation & Aerospace Exhibition in Zhuhai, south China's Guangdong Province,Nov. 12, 2014. The 10th China International Aviation & Aerospace Exhibition, which takes place in Zhuhai from Nov. 11 to16, features various UAV drones for both military and civilian use.(Xinhua/Liang Xu)