名词
中文翻译：齿轮传动
同义词：
['gearbox', 'gear mechanism']
例句：
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1. The car's engine is running smoothly with the new gear box installed.
新安装的齿轮箱让汽车发动机运行得非常顺畅。
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2. The engineer used a special gear box to make the machine run more efficiently.
工程师使用了一个特殊的齿轮箱使机器运行得更加高效。
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3. The old gear box was worn out and needed to be replaced.
旧的齿轮箱磨损严重，需要更换。