名词
中文翻译：主要梁
同义词：
['main beam', 'main structure', 'main frame']
例句：
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1. The bridge is supported by a main beam.
这座桥由一根主梁支撑。
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2. The car was damaged during the accident, but the main beam remained intact.
汽车在事故中受损，但主梁仍然完好无损。
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3. The construction of the new bridge involved several main beams.
新桥梁的建设涉及几根主梁。