valley alluvial soil 中文意思是什麼
valley alluvial soil
解釋
山谷沖積土-
In loessal regions and alluvial valley fills of the western united states, both surface soil and subsoil are commonly friable.
在美國西部黃土區和沖積河谷里,表土和底土一般是容易破碎的。
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