Chinese Vice Premier Han Zheng (3rd L, front), also a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee, visits the exhibition area of the Smart China Expo in southwest China's Chongqing Municipality, Aug. 22, 2018. Han attended the opening ceremony of the first Smart China Expo in Chongqing Thursday and read a congratulatory letter sent by Chinese President Xi Jinping. (Xinhua/Pang Xinglei)