| 摘要 | 第1-6页 |
| Abstract | 第6-10页 |
| Introduction | 第10-16页 |
| Chapter 1 Overviewof Vagueness | 第16-45页 |
| ·Previous Studies on Vagueness | 第16-22页 |
| ·Previous Studies on Vagueness Aboard | 第16-20页 |
| ·Previous Studies on Vagueness at Home | 第20-22页 |
| ·Definitions of Rhetorical Vagueness | 第22-24页 |
| ·Types of Rhetorical Vagueness | 第24-45页 |
| ·Logic Vagueness | 第24-31页 |
| ·Semantic Vagueness | 第31-40页 |
| ·Figurative Vagueness | 第40-45页 |
| Chapter 2 Theoretical Framework | 第45-55页 |
| ·Context and Rhetorical Vagueness | 第45-46页 |
| ·Cooperative Principle and Rhetorical Vagueness | 第46-51页 |
| ·Politeness Principle and Rhetorical Vagueness | 第51-55页 |
| Chapter 3 A Pragmatic Analysis of Rhetorical Vagueness in President Obama's Political Speeches | 第55-109页 |
| ·Devices of Rhetorical Vagueness in President Obama's Political Speeches | 第55-89页 |
| ·Vague Words and Expressions in President Obama's Political Speeches | 第55-70页 |
| ·Hedges in President Obama's Political Speeches | 第70-79页 |
| ·Political Metaphors in President Obama's Political Speeches | 第79-84页 |
| ·Political Euphemisms in President Obama's Political Speeches | 第84-89页 |
| ·Pragmatic Function of Rhetorical Vagueness in President Obama's Political Speeches | 第89-109页 |
| ·Textual Function of Political Vagueness | 第89-96页 |
| ·Interpersonal Function of Political vagueness | 第96-109页 |
| Conclusion | 第109-112页 |
| Bibliography | 第112-116页 |
| Acknowledgments | 第116-117页 |
| 攻读硕士学位期间研究成果 | 第117页 |
