名词
中文翻译：Unknown
同义词：
['understructure', 'underframe structure']
例句：
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1. The engineer designed the new bridge with an underframe that could support heavy loads.
工程师设计了这座新桥，其下框架能够承受重载。
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2. The underframe of the car was damaged in the accident.
汽车的下框架在事故中受损。
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3. The underframe is crucial for the stability of the building.
下框架对于建筑的稳定性至关重要。