英语翻译oneadditionalpartisrequiredtothecompleteabasicengine.Becauseitisnecessarytopushthepistondownthcylindermorethanonce,inbetweendownstrokesitmustbereturnedtothetopofthecylinder.Todothis,aheavyflywheeli

　　英语翻译

　　oneadditionalpartisrequiredtothecompleteabasicengine.Becauseitisnecessarytopushthepistondownthcylindermorethanonce,inbetweendownstrokesitmustbereturnedtothetopofthecylinder.Todothis,aheavyflywheelismountedtotheendofthecrankshaft.Whenthepistonisforceddowned,thecrankshaftturns,andtheflywheelturnswithit.Becausethe

　　flywheelisheavy,itdoesnotslowdowneasily.Itsmomentumkeepsthecrankshaftturning.Therotationofthecrankshaftthenpushesthepistonbackuptothetpoofthecylinder.