名词
中文翻译：顶杆
同义词：
['camshaft', 'camshaft shaft', 'camshaft pinion', 'camshaft gear']
例句：
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1. The engine's performance is directly related to the quality of its overhead camshaft.
发动机的性能直接与其顶杆的质量有关。
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2.The new design has a more efficient overhead camshaft system.
新设计采用了更高效的顶杆系统。
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3. The engineers spent hours tweaking the overhead camshaft to improve fuel efficiency.
工程师们花费了数小时调整顶杆以提高燃油效率。