名词
中文翻译：曲柄式发动机零件
同义词：
['camshaft', 'rocker shaft']
例句：
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1.The car's engine is a crank stock that needs to be regularly checked for wear and tear.
这辆车的引擎是一个需要定期检查磨损的曲柄式发动机零件。
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2. The mechanic replaced the crank stock with a new one after the engine overheated.
在引擎过热后，机械师用一个新的曲柄式发动机零件替换了旧的。
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3. The old car had a crank stock that was rusted through, which made it difficult to start.
那辆旧车有一个锈透的曲柄式发动机零件，这使得它很难启动。