名词
中文翻译：曲柄
同义词：
['crankshaft', 'crankcase', 'crankpin']
例句：
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1. The car's engine is running smoothly because the crankshaft is well oiled.
汽车的引擎运行顺畅，因为曲轴得到了很好的润滑。
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2. The old clock had a crankcase that was worn out and needed to be replaced.
旧时钟有一个磨损的曲轴箱，需要更换。
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3. The mechanic checked the crankpins for any damage before starting the engine.
机械师检查了曲柄销是否有损坏，然后才启动发动机。