Aerial photo taken on March 31, 2019 shows an unmanned express delivery vehicle running on the street of Xiongan citizen service center in Xiongan New Area, north China's Hebei Province. The unmanned express delivery vehicle, independently researched and developed by Cainiao Network, Alibaba's logistics arm, was recently put into service at Xiongan citizen service center. The new energy vehicle can convey about 200 small packages at one time from delivery station to intelligent cabinet. (Xinhua/Jin Liangkuai)