名词短语
中文翻译：底框中心梁同义词
同义词：
['underframe', 'underframe and center beam', 'underframe and center brace']
例句：
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1. The underframe is designed to support the roof of the building.
底框设计用来支撑建筑物的屋顶。
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2. The center sill is crucial for ensuring the stability of the structure.
中心梁对于确保结构的稳定性至关重要。
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3. During construction, the underframe and center sill are carefully assembled.
在施工过程中，底框和中心梁被仔细组装。