名词
中文翻译：硬土层
同义词：
['hard earth', 'hard soil', 'solid subsoil']
例句：
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1.The construction crew has to excavate the hard subsoil before starting work.
施工队在开始工作之前必须挖掘硬土层。
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2. The soil in this area is particularly hard subsoil, which makes it difficult for plants to grow.
该地区的土壤特别硬，对植物生长非常困难。
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3. The engineer analyzed the hard subsoil and determined that it was not suitable for building a new road.
工程师分析了硬土层，并确定不适合建造新路。