名词
中文翻译：地下铺设
同义词：
['subway construction', 'underground construction', 'underpinning']
例句：
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1. The city is expanding its subway system to improve transportation.
该市正在扩展其地铁系统以改善交通。
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2. The construction of the new bridge began underground.
新桥的施工开始于地下。
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3. The engineers were working on the underpinning of the building.
工程师们正在为建筑物的地基加固工作。