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Politics involves reconciling differences through discussion and persuasion.Communication is therefore central to politics (quoted in Paul Chilton 2004: 71). Thisquotation tells us not only the nature of politics, but also the dependency relationshipbetween politics and language. Politics is indispensable to our social life and, moreimportant, affects almost all spheres of our lives. From the perspective of linguistics,politics is the use of language, because politicians rely on language to stage propagandaand to evoke the public's agreement so as to achieve their purposes.However, political discourses sometimes concern some specific fields which areunavoidably obscure to the public, after all many of them are ordinary people. Thus, inorder to make expressions exoteric and understandable becomes politicians' necessaryskills, they tend to make use of ordinary expressions which are familiar to people fromall walks of life to explain complex concepts and reveal their visions. When politiciansdeliver speeches, in order to explicate the obscure terms and jargons in a relativelycommon way, they have to employ a lot of metaphors. On the other hand, the Presidentand his policies and plans are calculated to appeal to the voters, nd we agree to Seminothat metaphor plays an important role in persuading in politics (Semino 2008: 36)，thesis_role6/thesis_detail.asp?item_id=org201211132244368526">https://guanli.51lunwen.org/thesis_role6/org201211132244368526 whichtherefore, results in the prevalence of metaphors in political discourses. It is for thosereasons that linguistics studies on political discourses have never ceased, and will attractmore attention.

1.1 Research background 调查背景
For the past decades of years, many scholars and researchers have had greatinterests in Lakoff and Johnsen's conceptual metaphor theory which views from acognitive angle. Many of those researches focus on theoretical field to study thedefinitions, classifications, mapping mechanisms and history of conceptual metaphors.Besides, a lot of scholars study the identifications, features, processes of understanding,functions, and realization bases of conceptual metaphors through the analyses of words,expressions, idioms, and different sorts of discourses. Lakoff has illustrated the mappingmechanism of some common metaphors and demonstrated us good examples ofanalyzing political discourses by looking into conceptual metaphors. And after that, moreand more scholars and linguistic students have shifted their attentions to the analysis ofconceptual metaphors in politics.In addition to theoretical researches, there are a lot of metaphorical studies onpolitical news or political comments on newspaper columns, and many analyses applythat theory to one particular political speech or a series of speeches delivered undercertain circumstances. Nevertheless, some studies are still at a superficial level in whichthey fail to give a detailed and systematic eKplanation.In recent years this situation has improved. Thank to theoretical improvements,exchanges of linguistic theories between China and Western countries, and the methodslearned from other fields, there emerged some papers, essays or articles devoted tometaphorical study from diachr本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。