subsoil

He embedded the pilings deep into the subsoil.

他桩深深打进地基下的中。

They embedded the pilings deep into the subsoil.

他们桩深深打进地基下的中。

Some movement in the building will occur as it settles into the subsoil.

房沉到下层，就会有动静。

In loessal regions and alluvial valley fills of the western United States, both surface soil and subsoil are commonly friable.

在美国西部黄区和冲积河谷，表和底一般是容易破碎的。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底。