| Chinese Abstract | 第1-5页 |
| English Abstract | 第5-10页 |
| Ⅰ． Introduction | 第10-15页 |
| Ⅱ． The Cognition and the Approach to Vague Language | 第15-32页 |
| 2．1 The Nature of Vagueness | 第15-26页 |
| 2．2 The Conversational Implicature Theory and Its Working in Vague Language Use | 第26-29页 |
| 2．3 The Analysis of Vague Language in This Paper | 第29-32页 |
| Ⅲ． Vague Language as a Speech Strategy by Employing the Conversational Implicature Theory | 第32-47页 |
| 3．1 Maxim of Quantity | 第32-40页 |
| 3．1．1 Giving the Right Amount of Information | 第32-35页 |
| 3．1．2 Deliberately Withholding/Not Revealin Information | 第35-40页 |
| 3．2 Maxim of Quality | 第40-44页 |
| 3．2．1 Filling Information Gaps | 第41-43页 |
| 3．2．2 Relaxing Conversational Atmosphere | 第43-44页 |
| 3．3 Maxim of Manner | 第44-45页 |
| Emphasis | 第45-47页 |
| Ⅳ． Vague Language as a Politeness Strategy | 第47-55页 |
| 4．1 Politeness Principle and the Face Theory | 第48-49页 |
| 4．2 Analysis of Vague Expressions with Maxims of the Politeness Principle | 第49-55页 |
| 4．2．1 Tact Maxim | 第49-50页 |
| 4．2．2 Generosity Maxim | 第50-51页 |
| 4．2．3 Approbation Maxim | 第51-52页 |
| 4．2．4 Modesty Maxim | 第52-53页 |
| 4．2．5 Agreement Maxim | 第53页 |
| 4．2．6 Sympathy Maxim | 第53-55页 |
| Ⅴ． Vague Language as a Speech Strategy for A Pragmatic Context | 第55-66页 |
| 5．1 Pragmatic Study on Context | 第55-58页 |
| 5．2 The Appropriateness of Vague Language Use in a Concrete Context | 第58-66页 |
| 5．2．1 The Roles of Context in Communication | 第59-64页 |
| 5．2．2 Inappropriate Use of Vague Language Creates Communicative Failures | 第64-66页 |
| Ⅵ． Conclusion | 第66-69页 |
| Bibliography | 第69-74页 |
