During some periods, the bottom layer of the world's oceans comes from cold, dense water sinking in the far North Atlantic.

在某些时期，世界海洋的底层来自遥远的北大西洋下沉的寒冷、稠密的水。

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Cod live in the bottom layer of the ocean.

鳕栖于海洋底层。

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The bottom layer of the cloud is the infrastructure services layer.

云的底层是基础结构服务层。

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The most basic version of the battery used magnesium for the top layer and antimony for the bottom layer.

BBC: Liquid metal promise for future batteries

The bottom layer has hundreds or thousands of tiny intersecting liquid-handling channels, each about the width of a human hair (100 microns).

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"I have friends that worked at hedge funds ... and they're now trying to get into sales positions, and they still have to start from the bottom layer, " Akins says.

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