版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
Word文档TED英语演讲稿:解密爱情与出轨Idliketotalktodayaboutthetwobiggestsocialtrendsinthecomingcentury,andperhapsinthenext10,000years.ButIwanttostartwithmyworkonromanticlove,becausethatsmymostrecentwork.WhatIandmycolleaguesdidwasput32people,whoweremadlyinlove,intoafunctionalMRIbrainscanner.17whoweremadlyinloveandtheirlovewasaccepted;and15whoweremadlyinloveandtheyhadjustbeendumped.AndsoIwanttotellyouaboutthatfirst,andthengoonintowhereIthinkloveisgoing.
Whattistolove?Shakespearesaid.Ithinkourancestors--Ithinkhumanbeingshavebeenwonderingaboutthisquestionsincetheysataroundtheircampfiresorlayandwatchedthestarsamillionyearsago.Istartedoutbytryingtofigureoutwhatromanticlovewasbylookingatthelast45yearsofresearchon--justthepsychologicalresearch--andasitturnsout,theresaveryspecificgroupofthingsthathappenwhenyoufallinlove.ThefirstthingthathappensiswhatIcall--apersonbeginstotakeonwhatIcall,specialmeaning.Asatruckdriveroncesaidtome,hesaid,Theworldhadanewcenter,andthatcenterwasMaryAnne.
GeorgeBernardShawsaiditalittledifferently.Hesaid,Loveconsistsofoverestimatingthedifferencesbetweenonewomanandanother.Andindeed,thatswhatwedo.(Laughter)Andthenyoujustfocusonthisperson.Youcanlistwhatyoudontlikeaboutthem,butthenyousweepthatasideandfocusonwhatyoudo.AsChaucersaid,Loveisblind.
Intryingtounderstandromanticlove,IdecidedIwouldreadpoetryfromallovertheworld,andIjustwanttogiveyouoneveryshortpoemfromeighth-centuryChina,becauseitsanalmostperfectexampleofamanwhoisfocusedtotallyonaparticularwoman.Itsalittlebitlikewhenyouaremadlyinlovewithsomebodyandyouwalkintoaparkinglot--theircarisdifferentfromeveryothercarintheparkinglot.Theirwineglassatdinnerisdifferentfromeveryotherwineglassatthedinnerparty.Andinthiscase,amangothookedonabamboosleepingmat.
Anditgoeslikethis.ItsbyaguycalledYuanChen:Icannotbeartoputawaythebamboosleepingmat.ThenightIbroughtyouhome,Iwatchedyourollitout.Hebecamehookedonasleepingmat,probablybecauseofelevatedactivityofdopamineinhisbrain,justlikewithyouandme.Butanyway,notonlydoesthispersontakeonspecialmeaning,youfocusyourattentiononthem.Youaggrandizethem.Butyouhaveintenseenergy.AsonePolynesiansaid,hesaid,Ifeltlikejumpinginthesky.Youreupallnight.Yourewalkingtilldawn.Youfeelintenseelationwhenthingsaregoingwell;moodswingsintohorribledespairwhenthingsaregoingpoorly.Realdependenceonthisperson.AsonebusinessmaninNewYorksaidtome,hesaid,Anythingsheliked,Iliked.Simple.Romanticloveisverysimple.
Youbecomeextremelysexuallypossessive.Youknow,ifyourejustsleepingwithsomebodycasually,youdontreallycareiftheyresleepingwithsomebodyelse.Butthemomentyoufallinlove,youbecomeextremelysexuallypossessiveofthem.IthinkthatthatisaDarwinian--theresaDarwinianpurposetothis.Thewholepointofthisistopulltwopeopletogetherstronglyenoughtobegintorearbabiesasateam.
Butthemaincharacteristicsofromanticlovearecraving:anintensecravingtobewithaparticularperson,notjustsexually,butemotionally.Youdmuchrather--itwouldbenicetogotobedwiththem,butyouwantthemtocallyouonthetelephone,toinviteyouout,etc.,totellyouthattheyloveyou.Theothermaincharacteristicismotivation.Themotorinyourbrainbeginstocrank,andyouwantthisperson.
Andlastbutnotleast,itisanobsession.WhenIputthesepeopleinthemachine,beforeIputthemintheMRImachine,Iwouldaskthemallkindsofquestions.Butmymostimportantquestionwasalwaysthesame.Itwas:Whatpercentageofthedayandnightdoyouthinkaboutthisperson?Andindeed,theywouldsay,Allday.Allnight.Icanneverstopthinkingabouthimorher.
Andthen,theverylastquestionIwouldaskthem--Iwouldalwayshavetoworkmyselfuptothisquestion,becauseIamnotapsychologist.Idontworkwithpeopleinanykindoftraumaticsituation.Andmyfinalquestionwasalwaysthesame.Iwouldsay,Wouldyoudieforhimorher?And,indeed,thesepeoplewouldsayYes!asifIhadaskedthemtopassthesalt.Iwasjuststaggeredbyit.Sowescannedtheirbrains,lookingataphotographoftheirsweetheartandlookingataneutralphotograph,withadistractiontaskinbetween.Sowecouldlookatthesamebrainwhenitwasinthatheightenedstateandwhenitwasinarestingstate.Andwefoundactivityinalotofbrainregions.Infact,oneofthemostimportantwasabrainregionthatbecomesactivewhenyoufeeltherushofcocai.Andindeed,thatsexactlywhathappens.
Ibegantorealizethatromanticloveisnotanemotion.Infact,Ihadalwaysthoughtitwasaseriesofemotions,fromveryhightoverylow.Butactually,itsadrive.Itcomesfromthemotorofthemind,thewantingpartofthemind,thecravingpartofthemind.Thekindofmind--partofthemind--whenyourereachingforthatpieceofchocolate,whenyouwanttowinthatpromotionatwork.Themotorofthebrain.Itsadrive.
Andinfact,Ithinkitsmorepowerfulthanthesexdrive.Youknow,ifyouasksomebodytogotobedwithyou,andtheysay,No,thankyou,youcertainlydontkillyourselforslipintoaclinicaldepression.Butcertainly,aroundtheworld,peoplewhoarerejectedinlovewillkillforit.Peopleliveforlove.Theykillforlove.Theydieforlove.Theyhavesongs,poems,novels,sculptures,paintings,myths,legends.Inover175societies,peoplehavelefttheirevidenceofthispowerfulbrainsystem.Ihavecometothinkitsoneofthemostpowerfulbrainsystemsonearthforbothgreatjoyandgreatsorrow.
AndIvealsocometothinkthatitsoneofthreebasicallydifferentbrainsystemsthatevolvedfrommatingandreproduction.Oneisthesexdrive:thecravingforsexualgratification.W.H.Audencalleditanintolerableneuralitch,andindeed,thatswhatitis.Itkeepsbotheringyoualittlebit,likebeinghungry.Thesecondofthesethreebrainsystemsisromanticlove:thatelation,obsessionofearlylove.Andthethirdbrainsystemisattachment:thatsenseofcalmandsecurityyoucanfeelforalong-termpartner.
AndIthinkthatthesexdriveevolvedtogetyououtthere,lookingforawholerangeofpartners.Youknow,youcanfeelitwhenyourejustdrivingalonginyourcar.Itcanbefocusedonnobody.
Ithinkromanticloveevolvedtoenableyoutofocusyourmatingenergyonjustoneindividualatatime,therebyconservingmatingtimeandenergy.AndIthinkthatattachment,thethirdbrainsystem,evolvedtoenableyoutotoleratethishumanbeing--(Laughter)--atleastlongenoughtoraiseachildtogetherasateam.
Sowiththatpreamble,Iwanttogointodiscussingthetwomostprofoundsocialtrends.Oneofthelast10,000yearsandtheother,certainlyofthelast25years,thataregoingtohaveanimpactonthesethreedifferentbrainsystems:lust,romanticloveanddeepattachmenttoapartner.
Thefirstiswomenworking,movingintotheworkforce.Ivelookedat130societiesthroughthedemographicyearbooksoftheUnitedNations.Andeverywhereintheworld,129outof130ofthem,womenarenotonlymovingintothejobmarket--sometimesvery,veryslowly,buttheyaremovingintothejobmarket--andtheyareveryslowlyclosingthatgapbetweenmenandwomenintermsofeconomicpower,healthandeducation.Itsveryslow.
Foreverytrendonthisplanet,theresacounter-trend.Weallknowofthem,butnevertheless--theArabssay,Thedogsmaybark,butthecaravanmoveson.And,indeed,thatcaravanismovingon.Womenaremovingbackintothejobmarket.AndIsaybackintothejobmarket,becausethisisnotnew.Formillionsofyears,onthegrasslandsofAfrica,womencommutedtoworktogathertheirvegetables.Theycamehomewith60to80percentoftheeveningmeal.Thedoubleincomefamilywasthestandard.Andwomenwereregardedasjustaseconomically,sociallyandsexuallypowerfulasmen.Inshort,werereallymovingforwardtothepast.
Then,womensworstinventionwastheplow.Withthebeginningofplowagriculture,mensrolesbecameextremelypowerful.Womenlosttheirancientjobsascollectors,butthenwiththeindustrialrevolutionandthepost-industrialrevolutiontheyremovingbackintothejobmarket.Inshort,theyareacquiringthestatusthattheyhadamillionyearsago,10,000yearsago,100,000yearsago.Weareseeingnowoneofthemostremarkabletraditionsinthehistoryofthehumananimal.Anditsgoingtohaveanimpact.
Igenerallygiveawholelectureontheimpactofwomenonthebusinesscommunity.Illonlyjustsayacoupleofthings,andthengoontosexandlove.Theresalotofgenderdifferences;anybodywhothinksmenandwomenarealikesimplyneverhadaboyandagirlchild.Idontknowwhyitisthattheywanttothinkthatmenandwomenarealike.
Theresmuchwehaveincommon,buttheresawholelotthatwedonothaveincommon.Weare--inthewordsofTedHughes,Ithinkthatwewerebuilttobe--wereliketwofeet.Weneedeachothertogetahead.Butwedidnotevolvetohavethesamebrain.
Andwerefindingmoreandmoreandmoregenderdifferencesinthebrain.Illonlyjustuseacoupleandthenmoveontosexandlove.Oneofthemiswomensverbalability.Womencantalk.
Womensabilitytofindtherightwordrapidly,basicarticulationgoesupinthemiddleofthemenstrualcycle,whenestrogenlevelspeak.Butevenatmenstruation,theyrebetterthantheaverageman.Womencantalk.Theyvebeendoingitforamillionyears;wordswerewomenstools.Theyheldthatbabyinfrontoftheirface,cajolingit,reprimandingit,educatingitwithwords.And,indeed,theyrebecomingaverypowerfulforce.
EveninplaceslikeIndiaandJapan,wherewomenarenotmovingrapidlyintotheregularjobmarket,theyremovingintojournalism.AndIthinkthatthetelevisionisliketheglobalcampfire.Wesitarounditanditshapesourminds.Almostalways,whenImonTV,theproducerswhocallme,whonegotiatewhatweregoingtosay,isawoman.Infact,Solzhenitsynoncesaid,Tohaveagreatwriteristohaveanothergovernment.
Today54percentofpeoplewhoarewritersinAmericaarewomen.Itsoneofmany,manycharacteristicsthatwomenhavethattheywillbringintothejobmarket.Theyvegotincrediblepeopleskills,negotiatingskills.Theyrehighlyimaginative.Wenowknowthebraincircuitryofimagination,oflong-termplanning.Theytendtobewebthinkers.
Becausethefemalepartsofthebrainarebetterconnected,theytendtocollectmorepiecesofdatawhentheythink,putthemintomorecomplexpatterns,seemoreoptionsandoutcomes.Theytendtobecontextual,holisticthinkers,whatIcallwebthinkers.
Mentendto--andtheseareaverages--tendtogetridofwhattheyregardasextraneous,focusonwhattheydo,andmoveinamorestep-by-stepthinkingpattern.Theyrebothperfectlygoodwaysofthinking.Weneedbothofthemtogetahead.Infact,theresmanymoremalegeniusesintheworld.Whenthe--andtheresalsomanymoremaleidiotsintheworld.(Laughter)Whenthemalebrainworkswell,itworksextremelywell.AndwhatIreallythinkthatweredoingis,weremovingtowardsacollaborativesociety,asocietyinwhichthetalentsofbothmenandwomenarebecomingunderstoodandvaluedandemployed.
Butinfact,womenmovingintothejobmarketishavingahugeimpactonsexandromanceandfamilylife.Foremost,womenarestartingtoexpresstheirsexuality.Imalwaysastonishedwhenpeoplecometomeandsay,Whyisitthatmenaresoadulterous?AndIsay,Whydoyouthinkmoremenareadulterousthanwomen?Oh,well--menaremoreadulterous!AndIsay,Whodoyouthinkthesemenaresleepingwith?And--basicmath!(Laughter)
Anyway.IntheWesternworld,womenstartsooneratsex,havemorepartners,expresslessremorseforthepartnersthattheydo,marrylater,havefewerchildren,leavebadmarriagesinordertogetgoodones.Weareseeingtheriseoffemalesexualexpression.And,indeed,onceagainweremovingforwardtothekindofsexualexpressionthatweprobablysawonthegrasslandsofAfricaamillionyearsago,becausethisisthekindofsexualexpressionthatweseeinhuntingandgatheringsocietiestoday.
Werealsoreturningtoanancientformofmarriageequality.Theyrenowsayingthatthe21stcenturyisgoingtobethecenturyofwhattheycallthesymmetricalmarriage,orthepuremarriage,orthecompanionatemarriage.Thisisamarriagebetweenequals,movingforwardtoapatternthatishighlycompatiblewiththeancienthumanspirit.
Werealsoseeingariseofromanticlove.91percentofAmericanwomenand86percentofAmericanmenwouldnotmarrysomebodywhohadeverysinglequalitytheywerelookingforinapartner,iftheywerenotinlovewiththatperson.Peoplearoundtheworld,inastudyof37societies,wanttobeinlovewiththepersonthattheymarry.Indeed,arrangedmarriagesareontheirwayoffthisbraidofhumanlife.
Ieventhinkthatmarriagesmightevenbecomemorestablebecauseofthesecondgreatworldtrend.Thefirstonebeingwomenmovingintothejobmarket,thesecondonebeingtheagingworldpopulation.TheyrenowsayingthatinAmerica,thatmiddleageshouldberegardedasuptoage85.Becauseinthathighestagecategoryof76to85,asmuchas40percentofpeoplehavenothingreallywrongwiththem.Sowereseeingtheresarealextensionofmiddleage.
AndIlooked--foroneofmybooks,Ilookedatdivorcedatain58societies.Andasitturnsout,theolderyouget,thelesslikelyyouaretodivorce.SothedivorceraterightnowisstableinAmerica,anditsactuallybeginningtodecline.Itmaydeclinesomemore.IwouldevensaythatwithViagra,estrogenreplacement,hipreplacementsandtheincrediblyinterestingwomen--womenhaveneverbeenasinterestingastheyarenow.Notatanytimeonthisplanethavewomenbeensoeducated,sointeresting,socapable.
AndsoIhonestlythinkthatiftherereallywaseveratimeinhumanevolutionwhenwehavetheopportunitytomakegoodmarriages,thattimeisnow.However,theresalwayskindsofcomplicationsinthis.Inthesethreebrainsystems:lust,romanticloveandattachment--dontalwaysgotogether.Theycangotogether,bytheway.Thatswhycasualsexisntsocasual.Withorgasmyougetaspikeofdopamine.Dopaminesassociatedwithromanticlove,andyoucanjustfallinlovewithsomebodywhoyourejusthavingcasualsexwith.Withorgasm,thenyougetarealrushofoxytocinandvasopressin--thoseareassociatedwithattachment.Thisiswhyyoucanfeelsuchasenseofcosmicunionwithsomebodyafteryouvemadelovetothem.
Butthesethreebrainsystems:lust,romanticloveandattachment,arentalwaysconnectedtoeachother.Youcanfeeldeepattachmenttoalong-termpartnerwhileyoufeelintenseromanticloveforsomebodyelse,whileyoufeelthesexdriveforpeopleunrelatedtotheseotherpartners.Inshort,werecapableoflovingmorethanonepersonatatime.Infact,youcanlieinbedatnightandswingfromdeepfeelingsofattachmentforonepersontodeepfeelingsofromanticloveforsomebodyelse.Itsasiftheresacommitteemeetinggoingoninyourheadasyouaretryingtodecidewhattodo.SoIdontthink,honestly,wereananimalthatwasbuilttobehappy;weareananimalthatwasbuilttoreproduce.Ithinkthehappinesswefind,wemake.AndIthink,however,wecanmakegoodrelationshipswitheachother.
SoIwanttoconcludewithtwothings.Iwanttoconcludewithaworry--Ihaveaworry--andwithawonderfulstory.Theworryisaboutantidepressants.Over100millionprescriptionsofantidepressantsarewritteneveryyearintheUnitedStates.Andthesedrugsaregoinggeneric.Theyareseepingaroundtheworld.Iknowonegirlwhosbeenontheseantidepressants,serotonin-enhancing--SSRI,serotonin-enhancingantidepressants--sinceshewas13.Shes23.
Shesbeenonthemeversinceshewas13.
Ivegotnothingagainstpeoplewhotakethemshortterm,whentheyregoingthroughsomethingperfectlyhorrible.Theywanttocommitsuicideorkillsomebodyelse.Iwouldrecommendit.ButmoreandmorepeopleintheUnitedStatesaretakingthemlongterm.Andindeed,whatthesedrugsdoisraiselevelsofserotonin.Andbyraisinglevelsofserotonin,yousuppressthedopaminecircuit.Everybodyknowsthat.Dopamineisassociatedwithromanticlove.Notonlydotheysuppressthedopaminecircuit,buttheykillthesexdrive.Andwhenyoukillthesexdrive,youkillorgasm.Andwhenyoukillorgasm,youkillthatfloodofdrugsassociatedwithattachment.Thethingsareconnectedinthebrain.Andwhenyoutamperwithonebrainsystem,youregoingtotamperwithanother.Imjustsimplysayingthataworldwithoutloveisadeadlyplace.
Sonow--(Applause)--thankyou.Iwanttoendwithastory.Andthen,justacomment.Ivebeenstudyingromanticloveandsexandattachmentfor30years.Imanidenticaltwin;Iaminterestedinwhywereallalike.WhyyouandIarealike,whytheIraqisandtheJapaneseandtheAustralianAboriginesandthepeopleoftheAmazonRiverareallalike.
Andaboutayearago,anInternetdatingservice,M,cametomeandaskedmeifIwoulddesignanewdatingsiteforthem.Isaid,Idontknowanythingaboutpersonality.Youknow?Idontknow.Doyouthinkyouvegottherightperson?Theysaid,Yes.Itgotmethinkingaboutwhyitisthatyoufallinlovewithonepersonratherthananother.
Thatsmycurrentproject;itwillbemynextbook.Theresallkindsofreasonsthatyoufallinlovewithonepersonratherthananother.Timingisimportant.Proximityisimportant.Mysteryisimportant.Youfallinlovewithsomebodywhossomewhatmysterious,inpartbecausemysteryelevatesdopamineinthebrain,probablypushesyouoverthatthresholdtofallinlove.YoufallinlovewithsomebodywhofitswithinwhatIcallyourlovemap,anunconsciouslistoftraitsthatyoubuildinchildhoodasyougrowup.
AndIalsothinkthatyougravitatetocertainpeople,actually,withsomewhatcomplementarybrainsystems.AndthatswhatImnowcontributingtothis.
ButIwanttotellyouastoryabout--toillustrate.Ivebeencarryingonhereaboutthebiologyoflove.Iwantedtoshowyoualittlebitaboutthecultureofit,too--themagicofit.Itsastorythatwastoldtomebysomebodywhohadhearditjustfromoneofthe--probablyatruestory.Itwasagraduatestudentat--ImatRutgersandmytwocolleagues--ArtAronisatSUNYStonyBrook.ThatswhereweputourpeopleintheMRImachine.
Andthisgraduatestudentwasmadlyinlovewithanothergraduatestudent,andshewasnotinlovewithhim.AndtheywereallataconferenceinBeijing.Andheknewfromourworkthatifyougoanddosomethingverynovelwithsomebody,youcandriveupthedopamineinthebrain,andperhapstriggerthisbrainsystemforromanticlove.(Laughter)Sohedecidedhedputsciencetowork,andheinvitedthisgirltogooffonarickshawridewithhim.
Andsureenough--Iveneverbeeninone,butapparentlytheygoallaroundthebusesandthetrucksanditscrazyanditsnoisyanditsexciting.Andhefiguredthatthiswoulddriveupthedopamine,andshewouldfallinlovewithhim.Soofftheygoandshessquealingandsqueezinghimandlaughingandhavingawonderfultime.Anhourlatertheygetdownoffoftherickshaw,andshethrowsherhandsupandshesays,Wasntthatwonderful?And,Wasntthatrickshawdriverhandsome!(Laughter)(Applause)
Theresmagictolove!ButIwillendbysayingthatmillionsofyearsago,weevolvedthreebasicdrives:thesexdrive,romanticloveandattachmenttoalong-termpartner.Thesecircuitsaredeeplyembeddedinthehumanbrain.TheyregoingtosurviveaslongasourspeciessurvivesonwhatShakespearecalledthismortalcoil.Thankyou.(Applause)
我认为它是从最初的交配和繁殖进展而来的最基本的三种不同的大脑组织。其中一种是性欲:对性的一种渴望。W.H.Auden称之为:不能忍受的神经性冲动的确,它就是那样的。它总是不停的烦扰着你,就像饥饿一样。其次个就是浪漫的爱情:那种让人欢欣鼓舞,使人痴迷的情窦初开。那第三种就是依靠那是一种从长期伴侣那里才能体会到的安静和平安。
我认为就是对性的渴望使你走出去从人群中查找伴侣你知道,在你开车的时候你可以感觉到它它会使人魂不守舍而浪漫爱情会使你专注只与一个人发生关系因此你储蓄着交配的能量,等待着时机而第三种大脑系统:依靠则进展成使你能够对他/她很忍耐(笑声)。这种宽容至少可以帮你撑过抚养小孩的这段时间。
开场白之后,我要争论两个最显著的社会趋势。其中一个产生于1002022年前,另一个则是25年前,这两种趋势都对性欲,爱情,和依靠这三种不同的脑系统产生过影响。
第一个阶段就是女人开头工作,成为劳动力的一部分。我查过联合国的世界人口统计年鉴中的130-150个国家发觉130个中有129个国家的女性在进入劳动市场过程可能比较缓慢的,但这个趋势确定无疑男性与女性之间经济力量,健康和教育方面的距离
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 2024年限定房地产宣传活动服务协议版B版
- 2024政府标准化办公用品采购协议文件版B版
- 2024年财产抵押借款合同范本2篇
- 2024年度单身公寓两室一厅租赁与合同解除条件合同3篇
- 2024施工合同管理及绿色施工技术指导协议3篇
- 2024年英文版住宅购买协议指南版B版
- 2024年版权许可使用合同(文学作品)
- 2024年英文离婚合同标准化文件一
- 2024年股权转让预定合同模板版B版
- 2024年职业伤害赔偿金合同:劳动者权益保障
- T∕CDHA 9-2022 热力管道安全评估方法
- 试验前准备状态检查报告
- 理正深基坑之钢板桩受力计算
- 根管治疗--ppt课件
- 国家开放大学电大专科《中国当代文学》期末试题及答案
- 广东话粤语姓名拼音大全
- 闸门及启闭机安装专项施工方案
- 应征公民体格检查表(征兵)
- 钢筋位置及保护层厚度检测ppt课件
- 岩石坚固性和稳定性分级表
- CNC程序控制管理办法
评论
0/150
提交评论