A plaque of Yangpu Economic Development Zone is seen on May 28, 2021. As one of the key parks in South China's Hainan Free Trade Port, Yangpu Economic Development Zone is an important window of the province's opening-up. It defines itself as an international shipping hub and a demonstration zone for international trade, attracting different types of firms including ship making, grain and oil processing to do business there. [Photo/Xinhua]