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TableofContentsAbstracti中文摘要iiTOC\o"1-3"\f\h\zHYPERLINK\l"_Toc256615018"1.IntroductionPAGEREF_Toc256615018\h1HYPERLINK\l"_Toc256615019"1.1ResearchbackgroundPAGEREF_Toc256615019\h1HYPERLINK\l"_Toc256615020"1.2AimsandobjectivesPAGEREF_Toc256615020\h1HYPERLINK\l"_Toc256615021"1.3Datacollectionandresearchmethod1HYPERLINK\l"_Toc256615022"1.4OrganizationPAGEREF_Toc256615022\h2HYPERLINK\l"_Toc256615023"2.LiteratureReviewPAGEREF_Toc256615023\h2HYPERLINK\l"_Toc256615024"2.1IntroductionPAGEREF_Toc256615024\h2HYPERLINK\l"_Toc256615025"2.2Previousrelatedstudies2HYPERLINK\l"_Toc256615026"2.3Definitionofvaguelanguage2HYPERLINK\l"_Toc256615027"2.3.1Theclassicaldefinition2HYPERLINK\l"_Toc256615028"2.3.2Theworkingdefinition3HYPERLINK\l"_Toc256615029"2.4Summary3HYPERLINK\l"_Toc256615030"3.ClassificationsofVagueLanguageinBusinessLetters4HYPERLINK\l"_Toc256615031"3.1Introduction4HYPERLINK\l"_Toc256615032"3.2Businesslettersinforeigntrade4HYPERLINK\l"_Toc256615033"3.2.1Definition,functionofbusinesslettersinforeigntrade4HYPERLINK\l"_Toc256615034"3.2.2Thebusinessletterswritingprinciples4HYPERLINK\l"_Toc256615035"3.3Classificationsofvaguelanguageinbusinessletters4HYPERLINK\l"_Toc256615036"3.3.1Lexicalvagueness5HYPERLINK\l"_Toc256615037"3.3.2Syntacticalvagueness6HYPERLINK\l"_Toc256615038"3.3.3Hedges6HYPERLINK\l"_Toc256615039"3.4Summary6HYPERLINK\l"_Toc256615040"4.SituationsandPragmaticFunctionsofVagueLanguageinBusinessLetters6HYPERLINK\l"_Toc256615041"4.1Introduction6HYPERLINK\l"_Toc256615042"4.2Thesituationsofvaguelanguageinbusinessletters7HYPERLINK\l"_Toc256615043"4.2.1Conveyingthebadnews7HYPERLINK\l"_Toc256615044"4.2.2Promotingfurthernegotiation8HYPERLINK\l"_Toc256615045"4.2.3Lackingspecificinformation8HYPERLINK\l"_Toc256615046"4.2.4Clarifyingtheobjectivesituation9HYPERLINK\l"_Toc256615047"4.2.5Withholdinginfor