| Acknowledgements | 第1-6页 |
| 摘要 | 第6-7页 |
| Abstract | 第7-12页 |
| Chapter 1 Introduction | 第12-16页 |
| ·Background | 第12-13页 |
| ·Aims and Significance | 第13-14页 |
| ·Methodology | 第14-15页 |
| ·Organization of the Thesis | 第15-16页 |
| Chapter 2 Literature Review | 第16-25页 |
| ·Previous Studies of Vagueness Abroad | 第16-20页 |
| ·Philosophical Study of Vagueness | 第16-18页 |
| ·Linguistic Studies of Vagueness | 第18-20页 |
| ·Clarifying Similar Concepts | 第20-21页 |
| ·Previous Studies of Vague Language at Home | 第21-23页 |
| ·The Focus of This Study | 第23-25页 |
| Chapter 3 Theoretical Framework | 第25-34页 |
| ·Characteristics of Vague Language | 第25-26页 |
| ·Relevance Theory | 第26-28页 |
| ·Ostensive-inferential Process | 第26-27页 |
| ·Relevance and Optimal Relevance | 第27-28页 |
| ·Adaptation Theory | 第28-30页 |
| ·Relevance-Adaptation Model Based on Relevance Theory and Adaptation Theory | 第30-34页 |
| ·Yang Ping's Model | 第30-32页 |
| ·Ran Yongping's Model | 第32-33页 |
| ·Main Claims of Relevance-Adaptation Model | 第33-34页 |
| Chapter 4 Analysis of Vague Language in English Reports of Chinese Emergencies Under Relevance-Adaptation Model | 第34-72页 |
| ·Emergency Reports | 第34-39页 |
| ·An Introduction of Emergencies | 第34-35页 |
| ·Principles of Emergency Reports | 第35-36页 |
| ·Reasons for the Existence of Vague Language in Emergency Reports | 第36-39页 |
| ·The Form of Vague Language in Emergency Reports | 第39-49页 |
| ·Vague Language at Lexical Level | 第39-47页 |
| ·Vague Language at Syntactic Level | 第47-49页 |
| ·Relevance-oriented | 第49-54页 |
| ·Vagueness in Headlines of Emergency Reports | 第49-50页 |
| ·Optimal Relevance in Emergency Reports | 第50-54页 |
| ·Contextual Correlates of Vagueness | 第54-67页 |
| ·Adaptation to Language Users | 第54-56页 |
| ·Adaptation to Mental World | 第56-59页 |
| ·Adaptation to Social World | 第59-66页 |
| ·Adaptation to Physical World | 第66-67页 |
| ·Functions of Vague Language in Emergency Reports | 第67-72页 |
| ·Giving the Right Amount of Information | 第67-68页 |
| ·Enhancing the Reliability | 第68页 |
| ·Avoiding Negative Effects | 第68-69页 |
| ·Enhancing Brevity | 第69-70页 |
| ·Enhancing Flexibility of News Language | 第70-72页 |
| Chapter 5 Conclusion | 第72-75页 |
| ·Major Findings | 第72-73页 |
| ·Limitations and Suggestions for Further Study | 第73-75页 |
| Bibliography | 第75-78页 |
| Appendix | 第78-81页 |
| Papers Published During the Study for M.A.Degree | 第81页 |
