The sea is thought to have been the cradle of life. 人们认为海洋曾经是生命的发源地。
As is known, the sea is the cradle of human. 海洋是人类生命的摇篮。
The sea is the cradle of mankind, which attracts generations of people to explore, research utilize it. And it will provide a broad prospect be for the survival and development of human. 海洋是人类的摇篮,也是人类赖以生存和发展的重要环境;它吸引着一代又一代的人们去探索研究和开发利用,并将为人类的生存和发展提供广阔的前景。