[N-VAR 可变名词]沉渣；沉淀物Sediment is solid material that settles at the bottom of a liquid, especially earth and pieces of rock that have been carried along and then left somewhere by water, ice, or wind.
Many organisms that die in the sea are soon buried by sediment.
海洋里死亡的许多生物会很快被沉淀物掩埋。
...ocean sediments.
海洋沉淀物
Oxford
sedi·ment/ˈsedɪmənt; NAmEˈsedɪmənt/noun[uncountable ]1the solid material that settles at the bottom of a liquid 沉淀物2( geology 地) sand, stones, mud, etc. carried by water or wind and left, for example, on the bottom of a lake, river, etc. 沉积物sedimentsedimentssedimentedsedimentingsedi·ment/ˈsedɪmənt; NAmEˈsedɪmənt/