| Acknowledgements | 第6-8页 |
| Abstract | 第8-9页 |
| 内容摘要 | 第11-15页 |
| Chapter 1 Introduction | 第15-19页 |
| 1.1 Background of the Research | 第15-17页 |
| 1.2 Objectives and Significance of the Research | 第17-18页 |
| 1.3 Organization of the Thesis | 第18-19页 |
| Chapter 2 Literature Review | 第19-37页 |
| 2.1 Theoretical Framework | 第19-32页 |
| 2.1.1 The Origin of Grammatical Metaphor | 第19-29页 |
| 2.1.2 Further Development of Grammatical Metaphor | 第29-32页 |
| 2.2 Previous Studies of Public Speech | 第32-37页 |
| 2.2.1 Previous Studies of Grammatical Metaphor in Public Speech | 第33-35页 |
| 2.2.2 Previous Studies on TED Speech | 第35-37页 |
| Chapter 3 Methodology | 第37-40页 |
| 3.1 Research Questions | 第37页 |
| 3.2 Data Collection | 第37-38页 |
| 3.3 Data Treatment | 第38-40页 |
| Chapter 4 Results | 第40-51页 |
| 4.1 Distribution of Ideational Metaphor in Science and Technology Discourses ofTED Speech | 第40-47页 |
| 4.2 Distribution of Interpersonal Metaphor in Science and Technology Discourses ofTED Speech | 第47-51页 |
| Chapter 5 Discussion | 第51-71页 |
| 5.1 Characteristics and Functions of Ideational metaphor in Science and TechnologyDiscourses of TED Speech | 第51-60页 |
| 5.1.1 Characteristics of Ideational Metaphor in Science and TechnologyDiscourses of TED Speech | 第51-52页 |
| 5.1.2 Functions of Ideational Metaphor in Science and Technology Discoursesof TED Speech | 第52-60页 |
| 5.1.2.1 To Enrich Sentence Meaning | 第52-54页 |
| 5.1.2.2 To Simplify Sentence Form | 第54-58页 |
| 5.1.2.3 To Achieve Textual Coherence | 第58-60页 |
| 5.2 Characteristics and Functions of Interpersonal Metaphor in Science andTechnology Discourses of TED Speech | 第60-71页 |
| 5.2.1 Characteristics of Interpersonal Metaphor in Science and TechnologyDiscourses of TED Speech | 第60-62页 |
| 5.2.2 Functions of Metaphor of Mood | 第62-65页 |
| 5.2.2.1 To Form Atmosphere of Intercommunication | 第62-64页 |
| 5.2.2.2 To Highlight Important Information | 第64-65页 |
| 5.2.3 Functions of Metaphor of Modality | 第65-71页 |
| 5.2.3.1 To Express Subjective Idea | 第66-67页 |
| 5.2.3.2 To Show Uncertainty | 第67-68页 |
| 5.2.3.3 To Create Objectivity | 第68-71页 |
| Chapter 6 Conclusion | 第71-75页 |
| 6.1 Major Findings of the Research | 第71-72页 |
| 6.2 Implications of the Research | 第72-73页 |
| 6.3 Limitations of the Research | 第73-75页 |
| References | 第75-81页 |
| Appendix | 第81-82页 |
