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英文文摘FOURSTAGEENGINEANDTWOSTAGEENGINEOPERATIONTHEACTIONSTAKINGPLACEINTHEENGINECYLINDERCANBEDIVIDEDINTOFOURSTAGES,ORSTROKES“STROKE”REFERSTOPISTONMOVEMENT；ASTROKEOCCURSWHENTHEPISTONMOVESFROMONELIMITINGPOSITIONTOTHEOTHERTHEUPPERLIMITOFPISTONMOVEMENTISCALLEDTDC（TOPDEADCENTER）THELOWERLIMITOFPISTONMOVEMENTISCALLEDBDCBOTTOMDEADCENTERASTROKEISPISTONMOVEMENTFROMTDCTOBDCORFROMBDCTOTDCINOTHERWORDS,THEPISTONCOMPLETESASTROKEEACHTIMEITCHANGESITSDIRECTIONOFMOTIONWHERETHEENTIRECYCLEOREVENTSINTHECYLINDERREQUIRESFOURSTROKESORTWOCRANKSHAFTREVOLUTIONS,THEENGINEISCALLEDAFOURSTROKECYCLEENGINE,ORAFOURCYCLEENGINETHEFOURPISTONSTROKESAREINTAKE,COMPRESSION,POWER,ANDEXHAUSTINTAKESTROKEONTHEINTAKESTROKE,THEINTAKEVALVEHASOPENED,THEPISTONISMOVINGDOWNWARD,ANDAMIXTUREOFAIRANDVAPORIZEDGASOLINEISENTERINGTHECYLINDERTHROUGHTHEVALVEPORTTHEMIXTUREOFAIRANDVAPORIZEDGASOLINEISDELIVEREDTOTHECYLINDERBYTHEFUELSYSTEMANDCARBURETORCOMPRESSIONSTROKEAFTERTHEPISTONREACHESBDC,ORTHELOWERLIMITOFITSTRAVEL,ITBEGINSTOMOVEUPWARDASTHISHAPPENS,T
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