They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past.
因此，它们可以重现海底扩张的过程，以及大陆和大洋盆地过去的地理位置发展过程。
Ocean scientists study the chemical make-up of the ocean, weather patterns, the geography of the ocean floor, and many other areas.
海洋科学家研究海洋的化学成分、气候模式、海底地貌以及许多其他领域。
Beijing also has geography to battle. It is ringed by mountains on three sides and far from the ocean, trapping pollution as if in a bowl.
北京所处地理位置也颇为不利。北京三面环山、远离大海，如同一个大碗，污染物质易聚不易散。(实习编辑：顾萍)。
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