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1、智课网TOEFL备考资料托福写作范文之冰箱的由来您当前的位置»智课教育官网»托福»托福写作»文章正文出国英语考试有哪些雅思6.5是什么水平雅思阅读评分标准托福阅读评分标准雅思和托福的区别TheoriginofRefrigeratorsBythemid-nineteenthcentury,theterm"icebox"hadenteredtheAmericanlanguage,buticewasstillonlybeginningtoaffectthedietofordinarycitizensintheUnitedStates.Theicetradegr
2、ewwiththegrowthofcities.Icewasusedinhotels,taverns,andhospitals,andbysomeforward-lookingcitydealersinfreshmeat,freshfish,andbutter.AftertheCivilWar(1861-1865),asicewasusedtorefrigeratefreightcars,italsocameintohouseholduse.Evenbefore1880,halfoftheicesoldinNewYork,Philadelphia,and
3、Baltimore,andone-thirdofthatsoldinBostonandChicago,wenttofamiliesfortheirownuse.Thishadbecomepossiblebecauseanewhouseholdconvenience,theicebox,aprecursorofthemodernrefrigerator,hadbeeninvented.Makinganefficienticeboxwasnotaseasyaswemightnowsuppose.Intheearlynineteenthcentury,thek
4、nowledgeofthephysicsofheat,whichwasessentialtoascienceofrefrigeration,wasrudimentary.Thecommonsensenotionthatthebesticeboxwasonethatpreventedtheicefrommeltingwasofcoursemistaken,foritwasthemeltingoftheicethatperformedthecooling.Nevertheless,earlyeffortstoeconomizeiceincludedwrapp
5、inguptheiceinblankets,whichkepttheicefromdoingitsjob.Notuntilneartheendofthenineteenthcenturydidinventorsachievethedelicatebalanceofinsulationandcirculationneededforanefficienticebox.Butasearlyas1803,andingeniousMarylandfarmer,ThomasMoore,hadbeenontherighttrack.Heownedafarmaboutt
6、wentymilesoutsidethecityofWashington,forwhichthevillageofGeorgetownwasthemarketcenter.Whenheusedaniceboxofhisowndesigntotransporthisbuttertomarket,hefoundthatcustomerswouldpassuptherapidlymeltingstuffinthetubsofhiscompetitorstopayapremiumpriceforhisbutter,stillfreshandhardinneat,
7、one-poundbricks.Oneadvantageofhisicebox,Mooreexplained,wasthatfarmerswouldnolongerhavetotraveltomarketatnightinordertokeeptheirproducecool.以上就是智课教育托福频道为大家整理的托福写作范文之冰箱的由来，希望对大家有帮助，更多资讯、资料请访问智课教育托福写作频道
