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破碎的。
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破碎的。
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