| 中文摘要 | 第1-4页 |
| ABSTRACT | 第4-7页 |
| Chapter I Introduction | 第7-10页 |
| ·Theoretical Background of the Study | 第7-8页 |
| ·The Intention and Significance of the Study | 第8页 |
| ·An Overview Structure of the Thesis | 第8-10页 |
| Chapter II An Overview of Lexical gap | 第10-17页 |
| ·An Overview of Theories in Cognitive Semantics | 第10页 |
| ·Previous Study of Lexical Gap | 第10-13页 |
| ·The Analysis of Causes of Lexical Gap in Previous Studies | 第13-15页 |
| ·The Causes from the Perspective of Culture Variations | 第13-14页 |
| ·The Causes from the Perspective of Language Mechanism | 第14-15页 |
| ·Summary and Limitations of Previous Studies | 第15-17页 |
| Chapter III The Discovery Process of Lexical Gap in Cognitive Semantics | 第17-26页 |
| ·Hierarchies | 第17-20页 |
| ·Proportional Series | 第20-23页 |
| ·Proportionality | 第20-22页 |
| ·Proportional Series in Animal Words and Kinship Words | 第22-23页 |
| ·Opposites | 第23-26页 |
| ·Complementary Opposites | 第24页 |
| ·Lexical Gap and Complementary Opposites | 第24-26页 |
| Chapter IV The Cognitive Causations of Lexical Gap | 第26-36页 |
| ·Lexical Gap and Mental Space Theory | 第26-28页 |
| ·Lexical Gap and Conceptual Blending Theory | 第28-30页 |
| ·Cognitive Motivations of Lexical gap | 第30-36页 |
| ·Psychological Salience | 第30-32页 |
| ·Perceptual Salience | 第32-34页 |
| ·Prototypicality | 第34-36页 |
| Chapter V Major Filling-up Methods to Lexical Gap | 第36-42页 |
| ·By Adding Phrases or Morphemes | 第36-37页 |
| ·By Applying Superordinates or Hyponyms as a Substitute | 第37-38页 |
| ·Metaphors | 第38-39页 |
| ·Cognitive Synonyms | 第39-42页 |
| Chapter VI Conclusion | 第42-44页 |
| Bibliography | 第44-47页 |
| Acknowledgements | 第47页 |
