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.

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.

在美国西部黄区和冲积河谷，和底一般是容易破碎。

Earthworms burrow deep into the subsoil.

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.

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，表土和底土一般是易破碎。

Earthworms burrow deep into the subsoil.

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，表土和底土一般是易破碎。