名词
中文翻译：主轴
同义词：
['main shaft', 'driving shaft']
例句：
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1. The car's engine is driven by a main shaft.
这辆车的引擎由一根主轴驱动。
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2. The machine's main shaft is visible through the transparent casing.
这台机器的主轴通过透明的外壳可见。
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3. The engineer adjusted the main shaft to ensure smooth operation.
工程师调整了主轴以确保操作顺畅。