n.海滩，海岸，涂，沙滩
Under the seabed there are many submerged reefs.
海底下有许多暗礁.
Earth movements in the past elevated great areas of the seabed.
地球过去的运动使海底大片地区隆起.
The cylinder was lifted from the seabed in a sling.
圆筒用吊索吊离海底.
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