| 摘要 | 第1-6页 |
| Abstract | 第6-10页 |
| Abbreviations | 第10-11页 |
| List of Tables | 第11-12页 |
| List of Figures | 第12-13页 |
| Chapter 1 Introduction | 第13-20页 |
| ·Background information | 第13-14页 |
| ·The rationale of the present study | 第14-17页 |
| ·Objectives of the present study | 第17-18页 |
| ·The significance of the study | 第18页 |
| ·Organization of the thesis | 第18-20页 |
| Chapter 2 Literature Review | 第20-29页 |
| ·Study of hedging from the perspective of logics | 第20-21页 |
| ·Study of hedging from the perspective of semantics | 第21-22页 |
| ·Study of hedging from the perspective of discourse | 第22-23页 |
| ·Study of hedging from the perspective of pragmatics | 第23-29页 |
| ·Hedging in general language texts | 第23-24页 |
| ·Hedging in scientific/academic writing | 第24-27页 |
| ·Inter-language and comparative studies of hedging | 第27-29页 |
| Chapter 3 Research Design | 第29-35页 |
| ·The theoretical framework | 第29-33页 |
| ·Prince et al's taxonomy | 第29-31页 |
| ·Hyland's model | 第31-32页 |
| ·The theoretical framework for the present study | 第32-33页 |
| ·Data collection | 第33-34页 |
| ·Methodology | 第34-35页 |
| Chapter 4 A Comparative Study of Hedging in SS and NS RAs | 第35-70页 |
| ·Overall distribution of hedges in the two RA corpora | 第35-37页 |
| ·Categories of hedges in the RA corpus | 第37-67页 |
| ·Lexical hedges | 第38-64页 |
| ·Modal verbs | 第38-46页 |
| ·Epistemic lexical verbs | 第46-52页 |
| ·Epistemic adverbs | 第52-58页 |
| ·Epistemic adjectives | 第58-62页 |
| ·Epistemic nouns | 第62-64页 |
| ·Non-lexical hedges | 第64-67页 |
| ·Phrasal hedges | 第64-66页 |
| ·Syntactic hedges | 第66-67页 |
| ·Distribution of hedging in different RA sections in two corpora | 第67-68页 |
| ·Summary | 第68-70页 |
| Chapter 5 Findings and Discussion | 第70-79页 |
| ·Major findings | 第70-73页 |
| ·Similarities in the applications of hedging devices in the two fields | 第70-71页 |
| ·Field discrepancies in the applications of hedging devices in the two fields | 第71-73页 |
| ·Pragmatic functions of hedging in RAs | 第73-79页 |
| ·The use of hedges in RAs in social sciences | 第73-76页 |
| ·The use of hedges in RAs in natural sciences | 第76-79页 |
| Chapter 6 Conclusion | 第79-84页 |
| ·Implications for the teaching of EAP | 第79-81页 |
| ·Limitations of the present study | 第81-82页 |
| ·Conclusion | 第82-84页 |
| References | 第84-92页 |
| Appendix Data Resources | 第92-111页 |
| Acknowledgements | 第111-112页 |
| 作者简介 | 第112页 |
