求一片英语短文的意思?CANyourememberamorn-查字典问答网
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  求一片英语短文的意思?CANyourememberamorningwhenyou’vewokenuptotheringofyouralarmclockandwishedyoucouldstayinbed?Youhaven’tsleptwell,youreyesareblearyandyourhairisamess.Worse,youcan’tstopyawning.Yaw

  求一片英语短文的意思?

  CANyourememberamorningwhenyou’vewokenuptotheringofyouralarmclockandwishedyoucouldstayinbed?Youhaven’tsleptwell,youreyesareblearyandyourhairisamess.Worse,youcan’tstopyawning.Yawningisuniversaltohumansandmanyanimals.Cats,dogsandfishyawnjustlikehumansdo!Yawningisaninvoluntary(无意识的)actionduringwhichyouopenyourmouthandbreathedeeply.Theaveragedurationofayawnisabout6seconds.Thepurposeandcauseofyawningarestillamystery.Scientistsarenotsurewhatcausesayawn.Peopleyawnwhentheyaretiredorbored,buttheyalsoyawnwhentheyaren’t.Therearemanyideasexplainingwhyweyawn.Oneideaisthatyawningisawayforthebodytobecomemorealertbytakinginmoreoxygen.Ayawnincreasestheheartrate,forcescarbondioxideoutofthelungs(肺)andbloodstream,andbringsoxygentothebrain.Butonestudyshowedthatvolunteersgivenalotofoxygendidnotyawnanylessthanbefore,whilethosegivenalotofcarbondioxidedidnotyawnmore.Anotherideaisthatearlyhumansusedyawningasaformofcommunication.Ifonedecideditwastimetosleep,theywouldtelltheothersbyyawningandtheywoulddoitinreturntoshowtheyagreed.Athirdexplanationcomesfrompsychology(心理学)professorGordonGallupofUniversityatAlbanyinNewYork.Hesaidthataspeopleyawn,theycoolofftheirbrains.“Brainsarelikecomputers,”hesaid.“Theyonlyoperateefficiently(有效率地)andeffectivelywhenthey’recool.”Manythingsconnectedtoyawning,likebeingtired,makethebrainhot,andyawningcanreducetheheat,hesaid.Scientistshavesentpeopleintospace,buttherearelotsofseemingly(表面上)simplethings,suchaswhyweyawn,orhiccup,thattheycannotfigureout.Nexttimeyouareinclassinthemorning,letoutabigyawnandwatchtoseehowmanyofyourclassmatesyawninresponse!

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2020-05-2714:12
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梁利军

  你记得那个当您被你的闹钟铃声吵醒但希望仍可以躺在床上的早晨吗?你还没睡得好,你的眼睛是朦胧的,你的头发是一团糟.更糟的是,你不能停止打呵欠.打哈欠是对人类和许多动物普遍的.猫、狗、鱼打哈欠就像人一样!打哈...

2020-05-27 14:14:06
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