名词
中文翻译：填土层
同义词：
['subsoil', 'substratum']
例句：
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1.The soil is very rich in nutrients, which makes it ideal for planting.
土壤富含养分，非常适合种植。
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2. The engineer carefully interbedded the bricks to ensure stability.
工程师仔细地将砖块交错放置，以确保稳定性。
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3.During construction, the builders interbedded the concrete slabs to create a solid foundation.
在建造过程中，建筑工人交错铺设混凝土板以形成坚固的基础。