潜艇上的声波仪器告诉我们，在海洋底部有一道海脊，横向坐落在冰流方向上。

Acoustic instruments on the submarine told us that there was a ridge at the bottom of the ocean, sitting transverse to the flow of ice.

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大部分的大陆架的活动发生在深水下的大洋洋底的海脊。

Much of the activity between the continental shelves takes place deep underwater at the mid-ocean ridges.

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洋底上的海脊形成了地球上最长的绵绵山脉，但这些山脉只有在很少的几个地方才上升到海面以上。

Ridges on the ocean floor form the longest continuous ranges of mountains on the planet, but only in a very few places on the Earth do these mountains rise above the ocean surface.

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