名词
中文翻译：下覆层
同义词：
['underlayer', 'base layer例句：1. The subcrust of the soil is rich in nutrients.（土壤的下覆层富含养分。）']
例句：
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1. The subcrust of the soil is rich in nutrients.
土壤的下覆层富含养分。
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2.The researcher found that the subcrust was responsible for the plant's growth.
研究人员发现，下覆层负责植物的生长。
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3.The subcrust was made up of clay and sand.
下覆层由粘土和沙子组成。