名词
中文翻译：Unknown
同义词：
['main frame', 'main beam', 'main girder']
例句：
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1. The engineer designed the new bridge to have a trunk siding of steel.
工程师设计了这座新桥，其主梁板由钢制成。
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2. The construction crew was working on the main frame of the building when it started to shake.
建筑工人在施工大楼的主框架时，大楼开始摇晃。
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3. The old house's wooden floors were replaced with a modern concrete main girder.
旧房子的木制地板被现代混凝土主梁所取代。