火花塞点燃压缩的空气燃油混合气，燃烧使混合气迅速膨胀。
The spark plug fires, igniting the compressed air-fuel mixture which produces a powerful expansion of the vapor.
化油器：向火花点火式发动机供给燃油和空气混合气的装置。
Carburetor: Device for supplying a spark-ignition engine with a mixture of fuel and air.
车辆的尾气成分在一定程度上反映了发动机燃油供给系统、空气供给系统的工作状况，气缸内混合气的混合和燃烧状况。
The emission ingredients can reflect the working condition of fuel supplying system and air supplying system, the mixing and burning condition in cylinder.
当活塞到达进气行程的下止点时，随着空气燃油的混合气进入气缸，进气门关闭。
When the piston reaches the bottom of the intake stroke, the intake valve closes, trapping the air-fuel mixture in the cylinder.
当活塞到达进气行程的下止点时，随着空气燃油的混合气进入气缸，进气门关闭。
When the piston reaches the bottom of the intake stroke, the intake valve closes, trapping the air-fuel mixture in the cylinder.
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