名词
中文翻译：前覆土层
同义词：
['subsoil', 'subsoil layer']
例句：
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1.The soil is rich in nutrients that support plant growth.
土壤富含养分，支持植物生长。
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2.The engineer studied the geology of the region to determine the best location for drilling.
工程师研究该地区的地质学，以确定钻探的最佳位置。
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3. The construction crew was working on excavating the pervious subsoil before laying down the foundation.
施工队伍正在挖掘前覆土层，以便铺设地基。