名词
中文翻译：传动轴
同义词：
['transmission shaft', 'gear shaft']
例句：
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1. The transmission shaft is essential for the smooth operation of the vehicle.
传动轴对于车辆的平稳运行至关重要。
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2. The gear shaft has been damaged due to excessive wear and tear.
由于过度磨损，齿轮轴已经损坏了。
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3. The engineers were working on replacing the old gear shaft with a new one.
工程师们正在更换旧的齿轮轴为新的。