A Yun-9 aircraft of the PLA Air Force returns to its base after taking pictures of the earthquake-hit area in Jiuzhaigou County, Southwest China’s Sichuan Province, Aug.9, 2017. After a four-hour flight, the transport aircraft provided the first high-resolution reconnaissance images of areas within a 20km radius of the epicenter, providing an important reference material for relief workers. (Photo/81.cn)
