substratum

柯林斯词典

substratum /sʌbˈstrɑːtəm, -ˈstrætəm/ (substrata)

• 1. N-COUNT A substratum of something is a layer that lies under the surface of another layer, or a feature that is less obvious than other features. 底层[正式] [with supp, usu N 'of' n]

  ...its deep substratum of chalk. ...它的深层的白垩底土。

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