| 摘要 | 第4-5页 |
| Abstract | 第5-6页 |
| Abbreviation | 第9-12页 |
| Chapter One Introduction | 第12-16页 |
| 1.1 Background of the Study | 第12-13页 |
| 1.2 Purpose of the Study | 第13-14页 |
| 1.3 Sigificance of the Study | 第14-15页 |
| 1.4 Organization of the Thesis | 第15-16页 |
| Chapter Two Literature Review | 第16-29页 |
| 2.1 Definitions of Lexical Bundles | 第16-18页 |
| 2.2 Classifications of Lexical Bundles | 第18-22页 |
| 2.3 Previous Studies of Lexical Bundles | 第22-29页 |
| 2.3.1 Studies of Lexical Bundles Abroad | 第22-25页 |
| 2.3.2 Studies of Lexical Bundles at Home | 第25-29页 |
| Chapter Three Theoretical Framework | 第29-32页 |
| 3.1 Criteria for the Identification of Lexical Bundles | 第29-30页 |
| 3.2 Criteria for the Classification of Lexical Bundles | 第30页 |
| 3.3 Corpus-based Approach | 第30-32页 |
| Chapter Four Methodology | 第32-37页 |
| 4.1 Research Questions | 第32页 |
| 4.2 Data Collection | 第32-34页 |
| 4.2.1 Selection of the Major | 第32页 |
| 4.2.2 Establishment of Corpora | 第32-34页 |
| 4.3 Analysis Instrument | 第34-36页 |
| 4.4 Research Procedures | 第36-37页 |
| Chapter Five Results and Discussion | 第37-62页 |
| 5.1 The Distribution of 4-word Lexical bundles in PA and MA | 第37-40页 |
| 5.2 Structural Analysis of 4-word Lexical bundles in PA and MA | 第40-50页 |
| 5.2.1 Structural Analysis of 4-word Lexical Bundles in PA | 第40-43页 |
| 5.2.2 Structural Analysis of 4-word Lexical Bundles in MA | 第43-47页 |
| 5.2.3 Structural Comparison of 4-word Lexical Bundles between PA and MA | 第47-50页 |
| 5.3 Functional Analysis of 4-word Lexical Bundles in RA and MA | 第50-62页 |
| 5.3.1 Functional Analysis of 4-word Lexical Bundles in PA | 第50-54页 |
| 5.3.2 Functional Analysis of 4-word Lexical Bundles in MA | 第54-57页 |
| 5.3.3 Functional Comparison of 4-word Lexical Bundles between PA and MA | 第57-62页 |
| Chapter Six Conclusion | 第62-66页 |
| 6.1 Findings of the Present Study | 第62-64页 |
| 6.2 Implications of the Present Study | 第64-65页 |
| 6.3 Limitations and Suggestions | 第65-66页 |
| Acknowledgements | 第66-67页 |
| References | 第67-70页 |
| AppendixⅠ4-word Lexical Bundles in PA | 第70-73页 |
| Appendix II 4-word Lexical Bundles in MA | 第73-77页 |
| Academic Achievements | 第77页 |
