| 摘要 | 第6-8页 |
| Abstract | 第8-9页 |
| Introduction | 第10-14页 |
| Chapter One Review of Previous Research on Hedging | 第14-26页 |
| 1.1 A Historical Overview of Research on Hedging | 第14-19页 |
| 1.2 The Taxonomies of Hedges | 第19-22页 |
| 1.3 Features of Hedges | 第22-24页 |
| 1.3.1 Context-dependence | 第22-23页 |
| 1.3.2 Variability | 第23页 |
| 1.3.3 Indeterminacy | 第23-24页 |
| 1.4 Summary | 第24-26页 |
| Chapter Two Theoretical Framework and Research Methodology | 第26-34页 |
| 2.1 Hedging as a Means of Knowledge Claim | 第26-30页 |
| 2.2 Identification of Hedges | 第30-31页 |
| 2.3 Objectives of the Present Research | 第31页 |
| 2.4 Data and Data Collection | 第31-32页 |
| 2.5 Data Analysis Procedures | 第32-34页 |
| Chapter Three Hedging in English Scientific Discourse | 第34-64页 |
| 3.1 Frequency and Distribution of Hedges in English Scientific Discoure | 第34-35页 |
| 3.2 Epistemic Modality in English Scientific Discourse | 第35-58页 |
| 3.2.1 Epistemic Lexical Verbs | 第36-40页 |
| 3.2.2 Modal Verbs | 第40-53页 |
| 3.2.3 Epistemic Adjectives | 第53-54页 |
| 3.2.4 Epistemic Adverbs | 第54-57页 |
| 3.2.5 Epistemic Nouns | 第57-58页 |
| 3.3 Quantifying Hedges | 第58-59页 |
| 3.4 Discourse-based Hedges | 第59-61页 |
| 3.4.1 Reference to Lack of Knowledge | 第59-60页 |
| 3.4.2 Reference to Limitations of Experimental Conditions | 第60-61页 |
| 3.5 Summary | 第61-64页 |
| Chapter Four Differences of Hedging in English Scientific Discourse of English and Chinese Researchers | 第64-71页 |
| 4.1 A Comparative Study of Hedging Devices by Chinese and Native English Researchers | 第64-68页 |
| 4.2 Factors Influencing the Use of Hedging | 第68-70页 |
| 4.2.1 L1 Influence on Interlanguage | 第68-69页 |
| 4.2.2 Extralinguistic Factors | 第69-70页 |
| 4.3 Summary | 第70-71页 |
| Conclusion | 第71-75页 |
| Bibliography | 第75-82页 |
| Appendix | 第82-87页 |
| Acknowledgements | 第87-88页 |
| 学位论文评阅及答辩情况表 | 第88页 |
