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BNC: 35255 COCA: 32521
substratum
noun [C] /ˈsʌbˌstrɑːtəm/
singularsubstratum
pluralsubstrata
  1. 1
    a layer of something that is below another layer, especially in the ground (尤指处于地下的)下层,底层
     Synonyms and related words
    Layers and coverings: surface, cover, layer...
  2. 2
    formal a basic feature or aspect of something that exists but is not easy to see (深层次的)基本特征(或特性),本质
     Synonyms and related words
    Features and qualities: feature, quality, factor...

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