| Abstract | 第8-9页 |
| 摘要 | 第10-12页 |
| Chapter One Introduction | 第12-15页 |
| 1.1 The Background of the Research | 第12-13页 |
| 1.2 The Purpose and Significance of the Research | 第13页 |
| 1.3 The Organization of the Thesis | 第13-14页 |
| 1.4 Summary | 第14-15页 |
| Chapter Two Literature Review | 第15-30页 |
| 2.1 Studies on Hedges | 第15-25页 |
| 2.1.1 Previous Studies on Hedges Abroad | 第15-20页 |
| 2.1.1.1 Definitions of Hedges | 第15-17页 |
| 2.1.1.2 Classifications of Hedges | 第17-20页 |
| 2.1.2 Previous Studies on Hedges at Home | 第20-25页 |
| 2.1.2.1 The Theoretical Exploration of Hedges | 第21-24页 |
| 2.1.2.2 The Practical Application of Hedges | 第24-25页 |
| 2.2 Studies on English Broadcasting News | 第25-28页 |
| 2.2.1 The Overview of English Broadcasting News | 第25页 |
| 2.2.2 Previous Studies on English Broadcasting News Abroad | 第25-26页 |
| 2.2.3 Previous Studies on English Broadcasting News at Home | 第26-28页 |
| 2.2.3.1 The Theoretical Exploration of English Broadcasting News | 第26-28页 |
| 2.2.3.2 The Practical Application of English Broadcasting News | 第28页 |
| 2.3 Summary | 第28-30页 |
| Chapter Three Research Methodology | 第30-33页 |
| 3.1 Research Questions | 第30页 |
| 3.2 Research Methods | 第30页 |
| 3.3 Data Collection | 第30-31页 |
| 3.4 Research Procedure | 第31页 |
| 3.5 Summary | 第31-33页 |
| Chapter Four Theoretical Framework | 第33-40页 |
| 4.1 The Introduction of Adaptation Theory | 第33-35页 |
| 4.1.1 The Theoretical Basis of Adaptation Theory | 第33-34页 |
| 4.1.2 The Development of Adaptation Theory at Home | 第34-35页 |
| 4.2 Making Choices | 第35-36页 |
| 4.3 Three Core Properties of Language | 第36页 |
| 4.3.1 Variability | 第36页 |
| 4.3.2 Negotiability | 第36页 |
| 4.3.3 Adaptability | 第36页 |
| 4.4 Four Aspects of Adaptation Theory | 第36-38页 |
| 4.5 Summary | 第38-40页 |
| Chapter Five A Study of Hedges in English Broadcasting News Texts | 第40-60页 |
| 5.1 Characteristics of the Frequency and Distribution of Hedges in English BroadcastingNews Texts | 第40-44页 |
| 5.1.1 Characteristics of the Frequency of Hedges in English Broadcasting News Texts..· 29 | 第40页 |
| 5.1.2 Characteristics of the Distribution of Hedges in English Broadcasting News Texts | 第40-44页 |
| 5.2 Example Analyses of Hedges in English Broadcasting News Texts | 第44-48页 |
| 5.2.1 Example Analyses of Rounders in English Broadcasting News Texts | 第44-45页 |
| 5.2.2 Example Analyses of Adaptors in English Broadcasting News Texts | 第45-47页 |
| 5.2.3 Example Analyses of Plausibility Shields in English Broadcasting News Texts | 第47页 |
| 5.2.4 Example Analyses of Attribution Shields in English Broadcasting News Texts | 第47-48页 |
| 5.3 Reasons for the Existence of Hedges in English Broadcasting News Texts from thePerspective of Adaptation Theory | 第48-55页 |
| 5.3.1 Hedges as Adaptation to the Mental World | 第49-52页 |
| 5.3.2 Hedges as Adaptation to the Social World | 第52-53页 |
| 5.3.3 Hedges as Adaptation to the Physical World | 第53-55页 |
| 5.4 Pragmatic Functions of Hedges in English Broadcasting News Texts | 第55-58页 |
| 5.4.1 Improving the Objectivity and Promptness | 第55-56页 |
| 5.4.2 Keeping Politeness and Appropriateness | 第56-57页 |
| 5.4.3 Increasing Persuasion and Achieve Protection | 第57-58页 |
| 5.4.4 Highlighting the Key Points | 第58页 |
| 5.5 Summary | 第58-60页 |
| Chapter Six Conclusion | 第60-63页 |
| 6.1 Major Findings | 第60-61页 |
| 6.2 Implications of the Present Research | 第61页 |
| 6.3 Limitations of the Thesis | 第61页 |
| 6.4 Suggestions for Further Study | 第61-63页 |
| Bibliography | 第63-70页 |
| Appendix | 第70-76页 |
| Acknowledgements | 第76-77页 |
| Publication | 第77页 |
