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BNC: 27032 COCA: 30114
subsoil
sʌbsɔɪl ˈsʌbˌsɔɪl
N-UNCOUNT 底土;心土;下层土 The subsoil is a layer of earth that is just below the surface soil but above hard rock. 底土;心土;下层土
  • ...the chalk subsoil on the site.

    那个工地的白垩底土

Trends of subsoil
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