- 释义：
- n.下层土，底土
- 例句：
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Some movement in the building will occur as It'settles into the subsoil.
楼房沉到下层土时,楼里就会有动静.
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Because of the intense cold subsoil of the tundra remains permanently frozen to a great depth.
由于酷寒,冻土带的下层土都冻得很深.
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Earthworms burrow deep into the subsoil.
蚯蚓深深地钻进底土.
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