A visitor buys fast food by smart payment in a smart town of the first Smart China Expo in southwest China's Chongqing Municipality, Aug. 23, 2018. The smart town, a special display zone of Smart China Expo covering an area of 30,000 square meters, was open to the public on Thursday. The town displays life in the future with smart technology for visitors, and will continue its operation for a year. (Xinhua/Tang Yi)