名词
中文翻译：上梁
同义词：
['upper member', 'upper chord例句：1. The upper rafter of the roof is where the main beam connects to it.（屋顶的上梁是主梁与它连接的地方。）']
例句：
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1. The upper rafter of the roof is where the main beam connects to it.
屋顶的上梁是主梁与它连接的地方。
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2.The upper rafter was damaged during the storm.
暴风雨期间，上梁受损了。
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3. The engineer checked the upper rafter for any signs of damage.
工程师检查了上梁是否有损坏的迹象。