名词
中文翻译：底层覆盖物
同义词：
['underlayer', 'subfloor', 'floor covering']
例句：
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1.The engineers laid down the foundation forthe new building.
工程师为新建筑打下了基础。
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2. The underlayment is designedto provide insulation and soundproofing.
底层覆盖物旨在提供隔热和隔音效果。
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3. The contractor installed the underlayment before starting the renovation project.
承包商在开始翻新项目之前安装了底层覆盖物。