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PAGEIAcknowledgementsManypeoplehavemadeinvaluablecontributions,bothdirectlyandindirectly,tomyresearch.Ifeeldeepgratitudetoallthosewhohaveofferedmesupport,helpandencouragementduringmystudyinJiangsuUniversityofScienceandTechnology.Firstofall,IamobligedtoexpressmysinceregratitudetomysupervisorProfessorZhaoXiawhohasgivenmealotofguidanceinmystudyofcognitivelinguistics,andmadepainstakingeffortstoinstructmeinthethesis-writing.Herkindnessandefficiencywilldefinitelyexertprofoundinfluenceonmyfuturelifeandwork.MydeepthanksmustgotoProfessorChengShanzhen,ProfessorZhouShujun,ProfessorGeJihong,ProfessorDaiYuqun,ProfessorZhangHongyan,ProfessorXiaGanlinandProfessorJiangWei,fortheirinstructivelecturesthatIhaveattended.Ishouldalsoexpressmygenuinegratitudetomywife,myclassmatesandroommateswhohavehelpedmeduringtheseyears.Lastbutnotleast,thethesisowesitsexistence,toalargeextent,toalargebodyofrelatedmaterials.Mybibliography,inthisrespectcanberegardedasthemostgenuineactofthankstotheauthorsofthosematerials.AbstractAbstractPAGEIIIAbstractPAGEIIAbstractLexicalpolysemyisthemostpervasiveandthemostimportantsemanticphenomenoninEnglish.Therefore,ithasbeenthefocusoflinguists’researches.Thetraditionalstudiesareconfinedtotheexternalreasonsthatcausethechangesofmeaningsofpolysemouswordswithouttakingaccountoftheirunderlyingcognitivemechanisms.Theyfailtorevealtheessentialnatureofpolysemouswords.Thepolysemousphenomenonhasattractedmuchconcernofcognitivelinguiststoo.Someofthecognitiveresearchersfocusedtheirmindstoomuchontheclassificationofthesemanticsystemofpolysemouswords(王德春,2002).Otherslaytheiremphasisontheanalysisofpolysemousperceptionwordsorbodily-partwordssuchashandorheart.However,theresearchwhichsystematicallystudiesinternalsemanticrelationsofpolysemouswordsandexplainsthenatureofthedevelopmentofthemeaningsofpolysemouswordsisstillrareintermsofcognitivelinguistics.Thisthesisconductsastudyofpolysemouswordsfromacognitiveperspectivewithintherelevanttheoreticalframeworkofcategorizatio
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