名词
中文翻译：下框架的长度
同义词：
['underframe length', 'frame length']
例句：
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1.The engineer measured the length of the underframe before installing it.
工程师在安装之前测量了下框架的长度。
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2. The underframe is crucial for supporting the weight of the roof.
下框架对于支撑屋顶的重量至关重要。
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3.The underframe must be properly secured to prevent any potential damage during installation.
下框架必须正确固定，以防止安装过程中的任何潜在损坏。