These are the important working sections of a car: the engine, the clutch (automatic transmissions have a special hydraulic coupling instead of a clutch), the transmission and differential (which are gears), and the wheels.

• 汽车有这样一些重要的零部件:发动机、离合器(自动变速器有特殊的液压联接器，所以不需要离合器)，变速器和差速器(即齿轮)，以及车轮。