In loessal regions and alluvial valley fills of the western United States, both surface soil and subsoil are commonly friable.
在美国西部和冲积河谷里,表和底一般是容易破碎。
In loessal regions and alluvial valley fills of the western United States, both surface soil and subsoil are commonly friable.
在美国西部和冲积河谷里,表和底一般是容易破碎。
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