It is well-known that the automobile is composed of four sections such as engine, chassis, body and electrical system. 众所周知，汽车都由发动机、底盘、车身以及电气系统四部分组成。 The engine which is called the "heart" of a vehicle is used to supply power for an automobile. It includes the fuel, lubricating, cooling, ignition and starting systems. Generally, an automobile is operated by internal combustion engine. The internal combustion engine burns fuel within the cylinders and converts the expanding force of the combustion or "explosion" into rotary force used to propel the vehicle. 发动机是汽车的心脏，向汽车提供动力。它包含有燃料系统、润滑系统、冷却系统、点火系统和起动系统。汽车一般采用内燃发动机。内燃发动机在汽缸里燃烧燃料将内燃所产生的膨胀力转变成旋转力，用以推动车辆前进。 The chassis is a framework used to assemble auto components on it. The chassis itself is divided into four systems like transmission system, suspension system, steering system and brake system. 底盘是一个用以总装汽车部件的框架。底盘本身可以分成四个系统，即传动系统、悬架系统、转向系统和制动系统。 The transmission system applies to the components needed to transfer the drive from the engine to the road wheels. The main components are clutch, gearbox, drive shaft, final drive and differential. 传动系统运用所需部件将发动机产生的动力传递到车轮。它的主要部件有离合器、变速器、传动轴、后桥和差速器。 The primary purpose of the suspension system is to increase strength and durability of components and to meet customers' requirements for riding comfort and driving safety. In automobile suspension, the major component is springs. The springs used on today's vehicles are engineered in a wide variety of types, sizes, rates and capacities. Spring types include leaf springs, coil springs and torsion...
