名词
中文翻译：底层土壤
同义词：
['subsoil', 'substratum例句：1. The soil under the tree was rich in nutrients.（树下的土壤富含养分。）2. The engineer used underclay to improve drainage in the foundation.（工程师使用下覆土层来改善地基的排水。）3. Underclay is a valuable resource for agriculture and gardening.（下覆土层是农业和园艺的重要资源。）']
例句：
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1. The soil under the tree was rich in nutrients.
树下的土壤富含养分。
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2. The engineer used underclay to improve drainage in the foundation.
工程师使用下覆土层来改善地基的排水。
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3. Underclay is a valuable resource for agriculture and gardening.
下覆土层是农业和园艺的重要资源。