名词
中文翻译：Unknown
同义词：
['underframe', 'underframed', 'underframed structure']
例句：
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1. The architect designed the building with an underframe that would support its weight.
建筑师设计了这座建筑的下框，以支撑其重量。
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2. The underframe of the bridge is made of steel and is reinforced to withstand heavy loads.
桥梁的下框由钢制成，并被加固以承受重载。
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3. The underframe of the house is hidden beneath the floorboards, providing a sturdy foundation for the structure.
房屋的下框隐藏在地板下面，为整个结构提供了稳固的基础。