A staff presents 5G smart house appliances during the 12th China-Northeast Asia Expo in Changchun, northeast China's Jilin Province, Aug. 24, 2019. The five-day expo themed on "enhancing mutual trust and cooperation to create beautiful prospects for Northeast Asia" opened Friday in the city of Changchun. Technologies and appliances related to 5G attracted many visitors. (Xinhua/Zhang Nan)