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TOEFL IELTS BNC: 5512 COCA: 7879

[ C or U ] a soft substance that is like a wet powder and consists of very small pieces of a solid material that have fallen to the bottom of a liquid沉淀物,沉渣

There was a brown sediment in the bottom of the bottle.瓶子底部有褐色的沉淀物。
sediments [ plural ]

sand, stones, etc. that slowly form a layer of rock沉积物(最终形成一层岩石的砂子、石头等)

It is hoped that the oil slick will sink to the seabed where it would be covered within a few years by sediments and eventually decompose.人们希望浮油会沉到海底,并且在数年内被沉积物覆盖,最终分解。
TOEFL IELTS BNC: 5512 COCA: 7879
TOEFL IELTS BNC: 5512 COCA: 7879
TOEFL IELTS BNC: 5512 COCA: 7879
sediment
Layers and coverings: surface, cover, layer...

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