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发布时间：2023-11-22 12:45:31 来源：文档文库

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趣味英语知识为何窨井盖是圆的

你或许会很不解，小爱为什么会问你一个这么奇怪的问题。区区一个窨井盖，谁曾想过为什么会这么设计?可能你觉得这个问题不值得去思考，但是请先听听著名哲学家Descartes(笛卡尔的名言吧：

Ithink,thereforeIam.
“我思故我在”，这并非故弄玄虚，因为思考才能产生自我意识。思考得越多，我们就越完善，也越聪明。相反的，如果对什么事都懒得去思考，缺乏好奇心和求知欲，那么最终我们会变成同一种东西：笨蛋。

像窨井盖之类的东西，在我们生活中随处可见，一点也不新鲜，大家都懒得去想为什么会这样。但正因被我们无视，此类的思考才弥足珍贵。甚至你还可以借这种方式去锻炼英语，比方尝试用英语思考和解读“为什么窨井盖是圆的，而不是方的或三角的”。这绝非是一个无聊的问题，看看答案，你一定会从中收获到别人不知道的知识，并从中获得灵感和启发，变得比别人更聪明。WhyAreManholeCoversRound?
Ifyou’reinthehabitoflookingdownatyourfeetasyouwalk,youmayhavenoticedthatmostmanholes,andtheircovers,areround.Orperhapsyou’vebeeninajobinterviewwhereyourprospectiveemployeraskedthisquestion(whichapparentlyhappensenoughthatitwasincludedinthethirdeditionof“TheCompleteIdiot’sGuidetoJobInterviews”.Hewantstoknowaboutyourabilitytothinkonyourfeet,andisn’tsomuch
interestedinthecorrectanswer,butitisagoodquestion.Ofallofthepotentialshapesformanholes,whywasacirclechosen?
Thereareanumberofreasons,aordingtoLarryScheckelinhisbook“AskAScienceTeacher:250AnswerstoQuestionsYou'veAlwaysHadAboutHowEverydayStuffReallyWorks”.Manholesareroundbecause“itisthebestshapetoresistthepressionofEartharoundit.”Roundshapesareeasiertomanufacturethansquareorrectangularshapes,andbecausemanholecoversareheavy,beingroundmakesthemeasiertomovefromplacetoplace(justrollthem!.Asanaddedbenefit,workersdon’tneedtolineupthecoverswithanyangles,makingroundcoverseasytoslipintoplace.
Butperhapsthebiggestreasonthatmanholecoversareroundisthatroundcoverscan’tfallthroughacircularopening.“Forallmanholes,thereisa‘lip’aroundtherimofthehole,holdingupthecover,whichmeansthattheunderlyingholeissmallerthanthecover,”Scheckelwrites.“Aroundmanholecovercan’tfallthroughitscircularopening,becausenomatterhowyoupositionit,thecoveriswiderthanthehole.Butasquare,rectangular,orovalmanholecovercouldfallinifitwasinserteddiagonallyintothehole,”whichwouldbebadnewsforunobservantpedestriansanddriversalike.

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