名词
中文翻译：下梁
同义词：
['downstrap', 'downbrace']
例句：
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1. The car's downbeam is broken, so we needto fix it immediately.
汽车的下梁断了，所以我们需要立即修理。
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2. The engineercarefully measured the length of the downbeam before cutting it.
工程师仔细测量了下梁的长度，然后才进行切割。
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3.The beam was used to support the roofand prevent it from collapsing.
这个梁用来支撑屋顶，防止它坍塌。