subsoil
noun /ˈsʌbsɔɪl/
  /ˈsʌbsɔɪl/
 [uncountable]- the layer of soil between the surface of the ground and the hard rock below it底土;心土 
| 词汇 | subsoil | 
| 释义 | subsoilnoun /ˈsʌbsɔɪl/  /ˈsʌbsɔɪl/[uncountable] 
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