| Acknowledgements | 第1-5页 |
| Abstract | 第5-8页 |
| 摘要 | 第8-12页 |
| Chapter One Introduction | 第12-15页 |
| ·Origin of the Study | 第12-13页 |
| ·Significance of the Study | 第13页 |
| ·Methodology | 第13-14页 |
| ·Research Questions | 第13页 |
| ·Data Collection | 第13页 |
| ·Research Procedures | 第13-14页 |
| ·Organization of the Thesis | 第14-15页 |
| Chapter Two Literature Review | 第15-22页 |
| ·Previous Study of Vague Language | 第15-19页 |
| ·Study of Vague Language Abroad | 第15-17页 |
| ·Study of Vague Language at Home | 第17-18页 |
| ·Achievements and Limitations of Vague Language Study | 第18-19页 |
| ·Relevant Study of Public Service Advertising | 第19-22页 |
| ·Development of PSA | 第19页 |
| ·Previous Study of Chinese PSA | 第19-21页 |
| ·Achievements and Limitations of Previous Study | 第21-22页 |
| Chapter Three Theoretical Framework | 第22-28页 |
| ·Cooperative Principle | 第22-23页 |
| ·Politeness Principle | 第23-26页 |
| ·Lakoff's Theory of Politeness | 第23-24页 |
| ·Leech's Theory of Politeness | 第24-25页 |
| ·Brown and Levinson's Face Theory | 第25-26页 |
| ·Adaptation Theory | 第26-28页 |
| Chapter Four Vagueness in PSA for City Construction | 第28-45页 |
| ·Realization of Vagueness in PSA for City Construction | 第28-42页 |
| ·Vagueness on the Word Level | 第29-38页 |
| ·Nouns as Vague Words | 第30-32页 |
| ·Adjectives as Vague Words | 第32-35页 |
| ·Verbs as Vague Words | 第35-36页 |
| ·Classifiers as Vague Words | 第36-38页 |
| ·Vagueness on the Sentence Level | 第38-42页 |
| ·Vagueness in Metaphor | 第38-40页 |
| ·Vagueness in Antithesis | 第40-42页 |
| ·Reasons for Vagueness in PSA for City Construction | 第42-45页 |
| ·Objective Reasons | 第42-43页 |
| ·Subjective Reasons | 第43-45页 |
| Chapter Five Pragmatic Functions of Vagueness in PSA for City Construction | 第45-53页 |
| ·Leaving Readers Imagination Room | 第45-47页 |
| ·Being Polite to Readers | 第47-49页 |
| ·Being Adaptative | 第49-53页 |
| ·Adapting to Readers' Psychology | 第49-51页 |
| ·Adapting to PSA's Own Features | 第51-53页 |
| Chapter Six Conclusion | 第53-56页 |
| ·Major Findings of the Study | 第53-54页 |
| ·Implications of the Study | 第54页 |
| ·Limitations of the Study and Suggestions for Further Study | 第54-56页 |
| Works Cited | 第56-61页 |
| Appendix | 第61-63页 |
| Publications | 第63页 |
