| 摘要 | 第1-6页 |
| Abstract | 第6-8页 |
| Contents | 第8-10页 |
| List of Figuers | 第10-11页 |
| Chapter One Introduction | 第11-15页 |
| ·Research Background | 第11-12页 |
| ·Research Hypothesis and Research Questions | 第12-14页 |
| ·Significance and Structure of the Thesis | 第14-15页 |
| Chapter Two Literature Review | 第15-23页 |
| ·Previous Studies on Word Meaning | 第15-20页 |
| ·Previous Studies on Word Length | 第20-23页 |
| Chapter Three Theoretical Framework | 第23-31页 |
| ·Principle of Economy and its Origin | 第23-25页 |
| ·Pragmatic Development of the Principle of Economy | 第25-27页 |
| ·Cognitive Mechanisms to Language Economy | 第27-31页 |
| ·Metaphor | 第28-29页 |
| ·Metonymy | 第29-31页 |
| Chapter Four Methodology | 第31-36页 |
| ·Oxford Advanced Learner's Dictionary | 第31-32页 |
| ·Data Collection | 第32-34页 |
| ·Research Design | 第34-36页 |
| Chapter Five Quantitative Analysis of Polysemous Words in CollegeEnglish Vocabulary | 第36-48页 |
| ·Distribution of Word Meaning | 第36-37页 |
| ·Distribution of Word Length | 第37-38页 |
| ·Relation between Word Length and Quantity of Meanings | 第38-41页 |
| ·Discussions and Suggestions | 第41-48页 |
| ·Metaphor:A Cognitive Mechanism to Language Economy | 第41-43页 |
| ·Metonymy:A Cognitive Mechanism to Language Economy | 第43-46页 |
| ·Suggestions for College English Vocabulary Teaching and Learning | 第46-48页 |
| Chapter Six Conclusion | 第48-50页 |
| ·Major Findings | 第48-49页 |
| ·Limitations and Suggestions for Further Research | 第49-50页 |
| Acknowledgement | 第50-51页 |
| References | 第51-54页 |
| Appendix | 第54-61页 |
