n.海底；海床

Earth movements in the past elevated great area of the seabed. 地球過去的運(yùn)動使海底大片地區(qū)隆起。

The usual way to reclaim land is to pile sand rock on to the seabed. 通常的方法去開墾陸地是在海床上堆起沙石。

Divers need fine control over their buoyancy so that they don't kick the seabed. 潛水員需要很好的控制他們的浮力,以防撞擊到海床上。