名词
中文翻译：直列式凸轮轴
同义词：
['DOHC', 'DOHC engine', 'DOHC valvetrain']
例句：
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1. The new car has a DOHC engine that delivers more power.
这款新车搭载了DOHC发动机，动力更强。
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2. The DOHC valvetrain is responsible for regulating the fuel and air mixture in the engine.
DOHC阀传动系统负责调节发动机中的燃油和空气混合物。
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3. The DOHC design reduces vibrations and improves fuel efficiency.
DOHC设计减少了振动并提高了燃油效率。