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商业信函放置一个显着的作用，在国际交流，和他们的写作是相当困难的。重视，商业信函已经引起了研究人员的高度重视，并已应用于许多语言学理论施行本科生写作这些信件。随着英语出版的凝聚力，凝聚力被检定应用到各个领域，这也揭示了一些轻商务信函的写作。在本章中，它开始的研究背景，然后指出研究的意义，最后提出了结构的论文。Business letters place a significant role in international communication, and thewriting of them is rather hard. With great importance, business letters have arousedgreat attention of researchers, and lots of linguistic theories have been applied intothe writing of these letters. With the publication of cohesion in English, cohesion hasbeen applied into various fields, which also sheds some light on the writing ofbusiness letters. In this chapter, it begins with the background of the study, thenstates the significance of the research, and finally presents the structure of the thesis.

1.1 Research Background

众所周知，商务信函在国际商业经济和贸易中发挥不可替代的作用。他们占了近90％的所有书面的的字母（林德塞尔 - 罗伯茨，1995年），因此，他们作为公司与客户保持联系，在各个领域的根本联系。没有商业信函，许多公司之间的商业活动将是不可能的。此外，由于英语作为一种国际语言，商务英语信函的重要性不能被忽视。As is known to all, business letters play an irreplaceable role in internationalbusiness economy and trade. They account for almost 90 percent of all written letters(Lindsell-Roberts, 1995), thus, they serve as a fundamental linkage for companies tokeep in touch with their customers in various areas. Without business letters, manybusiness activities between companies will be impossible. Moreover, since Englishserves as an international use language, the importance of business English letterscannot be overlooked.
Despite of the significance, the writing of business letters is a rather thornyissue. This is especially true for college students who have been instructed writingfor many years but still fail to perform as well as natives do. This may be in part dueto the complexity of writing itself, in which writing is not only concerned with thewriters’ language competence, but also related to their textual competence, logicalthinking capability and learning and application ability, etc. Thus, it is no wonderthat students’ writing ability cannot be enhanced in a short period of time eventhough they have made great efforts to deal with writing. Another reason may beattributed to the fact is that the importance of writing is more or lessunderemphasized. It is a common phenomenon that teachers are inclined to attachgreat importance to sentences. It is the sentence rather than the text as a whole thathas been focused on (Johns, 1984). They lay stress on grammatical mistakes whereasscarce attention is paid to the instruction of how to organize a complete and coherenttext in writing courses. Without systematic and effective instruction, Chinesestudents of English find it rather hard to construct an organized and coherent writtentext in English (Yang Yuchen & Wen Zhaoyun, 1994). When they set out to write an essay, difficulties at the discourse level occur, in which incoherence proves to be acommon problem. Coherence constitutes an important part in determining thewriting quality of an essay, and incoherence in part lies in the poor or inadequate useof cohesive devices.
Cohesion is conceptualized as a semantic concept, concerning the relations ofmeaning that exist within a text (Halliday & Hasan, 1976). Cohesion and cohesivedevices take an important effect in predisposing a reader to find a text coherent(Hoey, 2000). Without cohesion, coherence in a text is hard to achieve. In order tohold meanings together, certain mechanism, that i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。