名词
中文翻译：基层
同义词：
['foundation layer', 'base layer']
例句：
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1.The subbase layer is crucial for the stability of the road surface.
基层对于道路表面的稳定性至关重要。
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2. In order to improve the durability of the concrete, it's important to ensure that the subbase layer is properly compacted.
为了提高混凝土的耐用性，确保基层被正确压实是很重要的。
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3. The engineer carefully inspected the subbase layer before laying the foundation beams.
工程师在铺设基础梁之前仔细检查了基层。