由于发动机在过冷状态下的启动,由发动机导入的混合空气燃料泄漏.泄漏的原因有三,分别以启动速度是低波动而造成的燃料颗粒与空气的不良混合,以及燃料的极小蒸发量、圆柱形侧壁的湿润、进气口与燃料的低温状态.为了弥补这些状况（指泄漏的原因）,并且有利于冷发动机的启动,额外的燃料必须被注入在手摇启动过程中.
PS：我猜测您单词大概打错了.lean off是leak off.cylindet则为cylinder.
英语翻译During a cold start ,the air-fuel mixture drawn in by en
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