名词
中文翻译：主梁
同义词：
['main beam', 'main pillar']
例句：
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1.The main beam of the bridge is visible from a distance.
从远处可以看到桥的主梁。
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2. Main pillars support the roof of the building.
主要柱子支撑着建筑物的屋顶。
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3. The engineer carefully measured the main beam before starting work.
工程师在开始工作前仔细测量了主梁。