A staff worker introduces the working mechanism of "Sui Shou Pai", an app that allows people to express their concerns by submiting pictures, at the Yangquan radio and television station in Yangquan, north China's Shanxi Province, April 15, 2019. Yangquan has been transforming from a coal-dependent city to a city applying new technologies of Big Data and information services to various aspects of social life and developments. From harboring Baidu's cloud computing center, to taking advantages of various apps and platforms to collect citizen's concerns, supply public information, and monitor production safety, etc., Yangquan has become a new smart city featuring artificial intelligence. (Xinhua/Yang Chenguang)