名词
中文翻译：主梁
同义词：
['main beam', 'main girder例句：1. The engineer designed the bridge to be strong enough for a principal brace.（工程师设计这座桥足够坚固，以承受主要梁的负荷。）']
例句：
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1. The engineer designed the bridge to be strong enough for a principal brace.
工程师设计这座桥足够坚固，以承受主要梁的负荷。
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2.The construction of the new road required the installation of several principal brace supports.
新道路的建设需要安装几根主要的支撑杆。
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3.The steel beam was used as a principal brace in the bridge's construction.
钢梁被用作桥梁建设的主要梁。