英语翻译One additional part is required to complete a basic engi

英语翻译
One additional part is required to complete a basic engine.Because it is neccessary to push the piston down the cylinder more than once,in between down strokes it must be returned to the top of the cylinder.To do this ,a heavy flywheel is mounted to the end of the crankshaft .When the piston is foeced down,The crankshaft turns,and the flywheel turns with it.Because the flywheel is heavy,it dose not slow down easily.Its momentum keeps the cankshaft turning .The rotation of the crankshaft then pushes the pistion back up to the top of the cylinder .
Engine types
Automobile engines may be classified in several different ways according to these design features:
Vallve arrangement
Engines may be classified according to the location of the valves and the number of valves per culinder.many engines have the valves located in the cylinder head,and these engines are referred to as overhead valve engenes.The majority of engines heave to valves per cylinder,but engines with for valves per cylinder have become increasingly popular in recent years.
camshaft location
Engines with a single camshaft positioned above the vale train on the cylinder head may be referred to as single overhead camshaft engines.Other engines have two camshafts located above the valve train in the cylinder head,and these engines are called dual overgead camshart engines.V-type engines,or DOHCengines have the camshaft located in the cylinder head.Some SOHC engines,or DOHC engines have the camshaft located in the cylinder head rather than above the valve train.Other engines have the camshaft possitioned in the cylinder block.
Ignition type
Engines may be classified as spark ignition,or compression ignition.In an SL engine,the air-fuel mixture in the combustion chamber is ignited by a spark at the spark plug electrodes.The fuel-air mixture in a CL engine is ignited by the heat of compression.Diesel engines ues the CI principle,and these engines have much higher compression than SI engines.
Cylinder arrangement
The most common arrangements of engine cylinders are in-line,V-type,and opposed.An in-line engine has the cylinders mounted vertically and positioned in aline directly behind each degrees or 90 degrees between the sides of the block .Other V-type engines have been used:for positioned horizontally across from each other.

要求一另外的部分完成一个基本的引擎.由于不止一次推挤在圆筒下的活塞是必要的,在下来冲程之间必须返回它到圆筒的上面.要做此,一个重的飞轮登上对曲轴的末端.当活塞foeced下来时,曲轴转动和飞轮轮与它.由于飞轮是重的,它药量没有容易地减速.它的动量保留cankshaft转动.曲轴的自转在圆筒的上面然后推挤pistion备份.
Engine类型
Automobile引擎也许被分类用几个不同的方式根据这些设计特点：
Vallve安排
Engines也许根据阀门的地点被分类,并且阀门的数量每culinder.many引擎的有位于气缸盖的阀门,并且这些引擎指顶上的阀门engenes.多数引擎拉到阀门每个圆筒,但是与阀门的引擎每个圆筒近年来变得日益普遍.
camshaft地点 与在谷火车之上被安置的一个唯一凹轮轴的Engines在气缸盖也许指唯一顶上的凹轮轴引擎.其他引擎有在气阀机构之上位于的二个凹轮轴在气缸盖,并且这些引擎称双重overgead camshart引擎.V类型引擎或者DOHCengines有位于气缸盖的凹轮轴.某一SOHC引擎或者DOHC引擎有位于气缸盖的凹轮轴而不是在气阀机构之上.其他引擎有possitioned的凹轮轴在气缸座.
Ignition类型
Engines也许分类为火花点火或者压燃.在SL引擎,在燃烧箱的航空燃料混合物被在火花塞电极的火花点燃.在分类引擎的燃料空气混合体被压缩热点燃.柴油引擎ues CI原则和这些引擎比SI引擎有更高的压缩.
Cylinder安排
The引擎圆筒的多数共同的安排是线型,V类型和反对.一个轴向引擎在aline有圆筒垂直登上了和安置直接地在每程度或90度之后在块之间的边.使用了其他V类型引擎：为水平地安置从彼此.