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.
在美国西部黄区和冲积河谷里,表
和底
一般是容易破碎
。
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