Such as Rotterdam, London, Hamburg, Shanghai and Guangzhou.

Whether it is a seaport or not is not important, but the throughput is important. London's seaport is influenced by warm current in winter, and it does not freeze in winter, so it has natural advantages. London is the capital of Britain, the national political, economic, cultural and transportation center, the largest seaport in China, the most important manufacturing city in Britain, and is famous for its general machinery and motors. There are also aircraft, precision instruments, automobiles, oil refining, chemistry, clothing, paper making, printing, food, cigarettes and other industries are very developed. This further promoted the development of maritime trade and made London a world-famous seaport. I hope I can help you.