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TOEFL IELTS BNC: 5512 COCA: 7879
sediment
noun [C/U] /ˈsedɪmənt/
singularsediment
pluralsediments
  1. a layer of a substance that forms at the bottom of a liquid 沉渣;沉淀物
     Synonyms and related words
    Layers and coverings: surface, cover, layer...
    1. a.
      a layer of sand, stones, dirt etc that becomes a layer of rock (最终形成岩石层的沙、石等)沉积物
       Synonyms and related words

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