Zheng Yongnian, Founding Director of the Advanced Institute of Global and Contemporary China Studies of the Chinese University of Hong Kong, Shenzhen (CUHK-SZ), speaks at a sub-forum themed "Free Trade Ports: The Global Trend" during Boao Forum for Asia annual conference in Boao, south China's Hainan Province, April 20, 2021. (Xinhua/Yang Guanyu)
