名词
中文翻译：曲柄臂
同义词：
['crank shaft', 'crank linkage']
例句：
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1.The car's crank arm is broken, so we need to replace it.
车的曲柄臂断了，所以我们需要更换它。
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2. The crank arm on the bike is worn out, and I think it needs to be replaced.
自行车的曲柄臂磨损了，我认为它需要被更换。
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3. The engineer carefully inspected the crank arm before making any repairs.
工程师在修理任何问题之前仔细检查了曲柄臂。