名词
中文翻译：齿轮
同义词：
['cog', 'pulley', 'wheel']
例句：
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1.The car has a gear shift lever on the dashboard.
汽车的仪表盘上有换挡杆。
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2. The old man used to drive a horse and cart with his wife.
那个老人以前和他的妻子一起用马和马车。
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3. The gears in the transmission are designed to be smooth and easy to use.
变速器中的齿轮被设计为平滑且易于使用。