名词
中文翻译：桁架梁
同义词：
['beam', 'girder', 'joist']
例句：
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1. The engineer designed the bridge to be strong enough to support the weight of the purlin struts.
工程师设计这座桥足够坚固，能够承受桁架支撑的重量。
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2. The construction crew was working diligently to install the purlin struts before the rain started.
施工队正努力工作，在下雨之前安装桁架支撑。
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3. The purlin struts are essential for supporting the weight of the roof and preventing it from collapsing.
桁架支撑对于支撑屋顶的重量和防止其坍塌至关重要。