| Synopsis | 第1-8页 |
| List of Abbreviations | 第8-9页 |
| Chapter 1 Introduction | 第9-14页 |
| ·Research Background | 第9-11页 |
| ·Motivation and Objectives of the Research | 第11-13页 |
| ·Organization of the Thesis | 第13-14页 |
| Chapter 2 Theoretical Preliminaries | 第14-31页 |
| ·Introduction to Hedges in Academic Discourse | 第14-20页 |
| ·Definitions of Hedge and Hedging | 第14-15页 |
| ·Importance of Hedging in Academic Discourse | 第15-16页 |
| ·Classification and Forms of Hedges | 第16-20页 |
| ·Introduction to Interpersonal Metafunction and Modality | 第20-31页 |
| ·Metafunctions in Systemic Functional Grammar | 第20-22页 |
| ·Interpersonal Metafunction | 第22页 |
| ·Modality System | 第22-31页 |
| ·Definition of Modality | 第23页 |
| ·Types of Modality | 第23-25页 |
| ·Ways of Expressing Modality | 第25-26页 |
| ·Value of Modal Expressions | 第26-28页 |
| ·Orientation of Modal Expressions | 第28-31页 |
| Chapter 3 Interface Analysis of Hedges and Modality | 第31-36页 |
| ·Analysis of Semantic Compatibility | 第31-33页 |
| ·Analysis of Pragmatic Compatibility | 第33-34页 |
| ·Overlap of Lexico-Grammatical Features | 第34-36页 |
| Chapter 4 Comparison and Contrast of Hedging Modals in Two Disciplines | 第36-56页 |
| ·Data and Methodology | 第36-39页 |
| ·Research Questions | 第36-37页 |
| ·Data Collection | 第37-38页 |
| ·Method | 第38-39页 |
| ·Results and Discussion | 第39-56页 |
| ·Research Results | 第39-44页 |
| ·Results of Hedging Modal Operators | 第39-41页 |
| ·Results of Hedging Mood Adjuncts | 第41-44页 |
| ·Discussion of Hedging Modals in Two Corpora | 第44-53页 |
| ·Analysis in terms of Hedging Modal Operators | 第44-49页 |
| ·Analysis in terms of Hedging Mood Adjuncts | 第49-53页 |
| ·Comparison and Contrast with Previous Studies | 第53-56页 |
| Chapter 5 Conclusion | 第56-61页 |
| ·Issues Explored in this Thesis and Major Findings | 第56-58页 |
| ·Implications for Reading and Writing Research Articles | 第58-59页 |
| ·Limitations of the Research | 第59页 |
| ·Suggestions for Future Research | 第59-61页 |
| Bibliography | 第61-64页 |
| Appendix | 第64-68页 |
| Abstract | 第68-73页 |
| 摘要 | 第73-77页 |
| Acknowledgements | 第77-78页 |
| 导师简介 | 第78页 |
| 学生简介 | 第78页 |
