| Abstract | 第1-7页 |
| 摘要 | 第7-8页 |
| Contents | 第8-10页 |
| Chapter 1 Introduction | 第10-13页 |
| ·Significance of the Present Research | 第10页 |
| ·Objectives of the Present Research | 第10-11页 |
| ·Data Collection and Research Methodology | 第11页 |
| ·Data Collection | 第11页 |
| ·Research Methodology | 第11页 |
| ·The Organization of the Thesis | 第11-13页 |
| Chapter 2 Literature Review | 第13-24页 |
| ·The State of Current Study of Prototype Theory at Home and Abroad | 第13-14页 |
| ·General Concept of Polysemy | 第14-20页 |
| ·Definition of Polysemy | 第15-17页 |
| ·Relationships between different meanings in polysemy | 第17-20页 |
| ·Cognitive Devices of Semantic Extension | 第20-24页 |
| ·Metaphor | 第21-22页 |
| ·Metonymy | 第22-24页 |
| Chapter 3 Theoretical Basis | 第24-35页 |
| ·The Development of Category Theory | 第25-26页 |
| ·The classical theory of categorization | 第25-26页 |
| ·Disadvantages of Classical Theory | 第26页 |
| ·Prototypical-based Approach to Categorization | 第26-32页 |
| ·The Theory of Family Resemblance | 第26-28页 |
| ·Prototype Theory | 第28-31页 |
| ·Characteristics of Prototype Theory | 第31-32页 |
| ·Different Levels of Category | 第32-35页 |
| Chapter 4 Prototype Research Through Prototype Theory in NewsDiscourse | 第35-60页 |
| ·The Analysis of Polysemy Based on Prototype theory | 第35-37页 |
| ·Application of Polysemy in English News Discourse Analyzing | 第37-56页 |
| ·Radiation in News Discourse | 第41-47页 |
| ·Concatenation in News Discourse | 第47-51页 |
| ·Metaphor in News Discourse | 第51-53页 |
| ·Metonymy in News Discourse | 第53-56页 |
| ·Other Phenomena of Polysemy in News Discourse | 第56-60页 |
| Chapter 5 Conclusion | 第60-64页 |
| ·Summary of Whole Paper | 第60页 |
| ·Implications for vocabulary Teaching | 第60-62页 |
| ·Limitations of the thesis and suggestions for further study | 第62-64页 |
| Bibliography | 第64-67页 |
| Acknowledgements | 第67页 |
