中文摘要: 随着经济的不断发展，中国企业的涉外商业活动日益频繁，商务英语信函成为最重要的商务沟通方式之一。尽管人们认为商务英语信函的语言应当追求准确无误，并且还制定了公认的“7C”原则；但相反，模糊语言却广泛地运用在各类商务英语信函中。顺应论视角下模糊语言在英语信函中的应用能够帮助企业树立良好的企业形象以及促进商务活动的顺利开展。本文基于顺应理论和商务英语信函中模糊语言的分类具体分析模糊语言在商务英语信函中的顺应及其语用功能，旨在加强读者对模糊语言的了解，更有效地书写商务英语信函，进而开展更加积极有效的商务活动，促进国内外贸易的发展。

关键词：顺应论; 商务英语信函; 模糊语言; 语用功能

Contents

中文摘要

Abstract

1. Introduction1

2. Adaptation Theory.2

2.1 Characteristic of adaptation .2

2.2 Four aspects of adaptation2

2.3 Choice-making in the adaptation process3

3. Adaptation of Vague Language in Business English Correspondence.4

  3.1 Adaptation to physical world4

3.1.1Adaptation to temporal reference.4

3.1.2 Adaptation to spatial reference.5

  3.2 Adaptation to mental world.5

3.2.1 Adaptation to addressor’s purpose6

3.2.2 Adaptation to addressor’s wishes6

3.3 Adaptation to social world.7

3.3.1 Adaptation to social status.7

3.3.2 Adaptation to cultural conventions8

4. Pragmatic Effects of Vague Language in English Business Correspondence9

4.1 Strengthening persuasiveness9

    4.2 Insuring flexibility.10

    4.3 Making expression more polite.10

    4.4 Enhancing the self-protection.11

5. Conclusion.11

References.12

Acknowledgments 14