名词
中文翻译：曲柄轮
同义词：
['crank', 'sprocket']
例句：
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1.The car's engine is running smoothly because the cog wheel is well-maintained.
汽车的发动机运行顺畅，因为曲柄轴保养得很好。
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2. The old clock had a worn-out cog wheel that needed to be replaced.
旧时钟有一个磨损的曲柄轴需要更换。
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3.The mechanic carefully removed the old cog wheel and installed a new one.
机械师仔细地拆下了旧的曲柄轴并安装了一个新的。