| 中文摘要 | 第6-7页 |
| Abstract | 第7-8页 |
| Chapter One:Introduction | 第13-19页 |
| 1.1 Research Background | 第14-16页 |
| 1.2 Research Motivation and Significance | 第16-17页 |
| 1.3 Organizational Structure of the Thesis | 第17-19页 |
| Chapter Two:Literature Review | 第19-37页 |
| 2.1 The Concept of Presupposition | 第19-31页 |
| 2.1.1 Historical Background | 第20-21页 |
| 2.1.2 Semantic Presupposition | 第21-24页 |
| 2.1.3 Pragmatic Presupposition | 第24-25页 |
| 2.1.4 Features of Presupposition | 第25-31页 |
| 2.2 An Overview of Newspaper Editorials | 第31-37页 |
| 2.2.1 Features of Newspaper Editorials | 第31-33页 |
| 2.2.2 Introduction to the Four Kinds of Newspapers | 第33-35页 |
| 2.2.3 Previous Studies of Newspaper Editorials | 第35-37页 |
| Chapter Three:Theoretical Framework | 第37-45页 |
| 3.1 Definition of Presupposition Triggers | 第37页 |
| 3.2 Classification of Presupposition Triggers | 第37-43页 |
| 3.2.1 Levinson's Classification | 第37-41页 |
| 3.2.2 Yule's Classification | 第41-42页 |
| 3.2.3 Verschueren's Classification | 第42页 |
| 3.2.4 He Ziran's Classification | 第42-43页 |
| 3.3 Application of Presupposition Triggers in Other Types of Discourses | 第43-45页 |
| Chapter Four:Research Methodology | 第45-50页 |
| 4.1 Research Questions and Hypotheses | 第45-46页 |
| 4.2 Research Method | 第46页 |
| 4.3 AntConc Corpus Tool and the Working Procedure | 第46-48页 |
| 4.4 Data Collection | 第48-50页 |
| Chapter Five:Analysis and Discussion | 第50-67页 |
| 5.1 Distribution of Presupposition Triggers in Sample Editorials | 第50-60页 |
| 5.1.1 Distribution of the Most Frequent Presupposition Triggers | 第56-58页 |
| 5.1.2 Distribution of the Least Frequent Presupposition Triggers | 第58页 |
| 5.1.3 Comparison of Presupposition Triggers in American and Chinese News Editorials | 第58-60页 |
| 5.2 The Functions of Presupposition Triggers in News Discourse | 第60-65页 |
| 5.2.1 The Function of Cohesion and Coherence | 第60-61页 |
| 5.2.2 The Function of Conciseness | 第61-63页 |
| 5.2.3 The Function of Euphemism and Concealment | 第63-64页 |
| 5.2.4 The Function of Focus Transfer | 第64-65页 |
| 5.3 Summary | 第65-67页 |
| Chapter Six:Conclusion | 第67-70页 |
| 6.1 Major Findings and Implications | 第67-68页 |
| 6.2 Limitations and Suggestions for Further Study | 第68-70页 |
| References | 第70-73页 |
| Appendices | 第73-78页 |
| Appendix A:Editorials from the New York Times | 第73-74页 |
| Appendix B:Editorials from the Birmingham News | 第74-75页 |
| Appendix C:Editorials from China Daily | 第75-76页 |
| Appendix D:Editorials from the Global Times | 第76-77页 |
| Appendix E：本文作者在攻读硕士学位期间发表论文情况 | 第77-78页 |
| Acknowledgement | 第78页 |
