名词
中文翻译：次梁
同义词：
['substructure', 'secondary structure例句：1. The engineer designed the sub-truss to support the weight of the building.（工程师设计了次梁来支撑建筑的重量。）']
例句：
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1. The engineer designed the sub-truss to support the weight of the building.
工程师设计了次梁来支撑建筑的重量。
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2. The construction crew was working on the sub-truss when it collapsed.
施工队在工作时次梁突然坍塌了。
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3. The new design of the sub-truss has improved the stability of the bridge.
新设计的次梁提高了桥梁的稳定性。