Earthworms burrow deep into the subsoil.

蚯蚓进底土。

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

在美国西部黄土区和冲积河谷里，土和底土一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底土。

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

在美国西部黄土区和冲积河谷里，表土和底土一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底。

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

在美国西区和冲积河谷里，表和底一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底土。

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

在美国西部黄土区和冲积河谷里，表土和底土一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底土。

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

在美国西部黄土区河谷里，表土底土一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底土。

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

在美国西部黄土区和冲积河谷里，表土和底土容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓进底土。

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

在美国西部黄土区和冲积河谷里，土和底土一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底土。

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

在美国西部黄土区河谷里，表土底土一般是容易破碎。

Earthworms burrow deep into the subsoil.

蚯蚓深深地钻进底土。

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

在美国西部黄土区和谷里，表土和底土一般是容易破碎。