An unmanned express delivery vehicle runs on a street beside the Xiong'an citizen service center in Xiong'an New Area, north China's Hebei Province, on March 31, 2019. The unmanned express delivery vehicle, independently researched and developed by Cainiao Network, Alibaba's logistics arm, was recently put into service at Xiong'an 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)