名词
中文翻译：齿轮
同义词：
['cog', 'gearbox', 'transmission']
例句：
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1. The car needs a new gear to get it going again.
这辆车需要换挡才能再次启动。
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2. The old clock had worn out its gears.
旧时钟的齿轮磨损了。
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3. The engineer adjusted the gears on the machine to make it run smoother.
工程师调整机器上的齿轮，使机器运行更顺畅。