名词
中文翻译：工厂的上层建筑
同义词：
['superstructure', 'overhead structure']
例句：
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1. The factory has a large overheadstructure that supports the roof.
这个工厂有一个大的上层结构，支撑着屋顶。
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2. Theoverhead structure is essential for maintaining the stabilityof the building.
上层结构对于保持建筑物的稳定性至关重要。
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3. The factory's overhead structureis designed to withstand heavy loads.
工厂的上层结构设计用来承受重负载。