Aerial photo taken on April 23, 2017 shows a container wharf of Yangshan Port in Shanghai, east China. Yangshan Port is China's first port built on islands. Shanghai, one of the most important cities in east China, has contrainer trade with more than 500 ports of 214 countries and regions. In 2016, Shanghai port has kept standing at No. 1 in container throughput in the world for seven years in a row. (Xinhua/Ding Ting)
