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Ⅰ.Introduction
 In this era of globalization, communications between China and America are more frequent. It becomes significant for us to gain a deeper understanding of American presidents' oratory. Obama serves as an example for us to study in this aspect.
 Until now, most people have been studying his oratory mainly through either Chinese translations of his speeches or interpretations by the media. And these studies are conducted through perspectives which are by no means rhetorically informed. Considering the fact that what we are dealing with is political oratory, it is high time that the rhetorical perspective be introduced into the process of interpreting Obama's political communication in its original context. Such a perspective will help us obtain a better approach to interpreting his oratory, and help us to understand history and culture of America.
 
 Ⅱ. A Brief Introduction to Rhetoric
 The choice of rhetoric is an important aspect of a speech. Rhetoric is the tools of the speaker’s craft. They have special uses, just like the tools of other professions. The choice of rhetoric has something to do with the speech style. Jonathan Swift said: use the right word in the right place. To use rhetoric correctly and exactly, one must analyze some important elements of rhetoric: the definition, the origination, the development, and the classification.
 2.1. Definition of Rhetoric
 The history of rhetoric is as long as the history of human civilization. Aristotle(384-322BC), the ancient Greek philosopher and esthetician considered to be the Hegel in the ancient world, wrote an epoch-making classical work Rhetoric expatiating on the art of rhetoric ,i.e. the art of influencing the thoughts of the audience and convincing the public in luxuriant language, or the art of delivering a successful speech. Rhetoric is not only the mark of the ancient Greek civilization, but also a fashion in the world today, an important segment inherited from generation by generation and inseparable from sociopolitical tussle, mercantile competition and daily communication.
 The theory of rhetoric in English is rooted in the classical rhetoric in the ancient Rome and Greece. And THE RHETORIC by Aristotle is the most famous classic. Aristotle began his works with “The combination of rhetoric and dialectic… it’s used by almost everyone, because everyone attempts to discuss questions, to establish claim, to cover himself/herself, and to debate others”. The diversities of figures of speech make speech more impressive and moving.
 2.2 Origination and Development
 Language is one of the most important tools among human beings. When people are making social communication, they are not only make language clear, fluent, logical and grammatical, but also on the basis of these features, make language lively, accurate, laconic, vivid, incisive and touching, so that the effect can be expressed the best. Therefore, human beings make full use of all kinds of factors of language, also make them into effect, correctly choose language strategies, and keep an adjusting, manufacturing, and decorating. Thus, rhetoric devices come into being.
 Rhetoric was at the center of the Educational process in Western Europe for some 2000 years. Traditionally, rhetoric referred to the systematic study of oratory. It applied t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。