| ACKNOWLEDGEMENT | 第7-8页 |
| ABSTRACT | 第8页 |
| 摘要 | 第9-12页 |
| LIST OF ABBRIVIATION | 第12-15页 |
| CHAPTER I INTRODUCTION | 第15-19页 |
| 1.1 Research Background | 第15-16页 |
| 1.2 Research Purpose and Research Questions | 第16-17页 |
| 1.3 Research Significance | 第17-18页 |
| 1.4 Structure of the Thesis | 第18-19页 |
| CHAPTER ⅡLITERATURE REVIEW | 第19-33页 |
| 2.1 Definitions of Lexical Bundles | 第19-20页 |
| 2.2 The Definition of Lexical Bundles Used in This Study | 第20-21页 |
| 2.3 Classification of Lexical Bundles | 第21-27页 |
| 2.3.1 Structural Classification of Lexical Bundles | 第22-23页 |
| 2.3.2 Functional Classification of Lexical Bundles | 第23-26页 |
| 2.3.3 The Relationship between Structural and Functional Lexical Bundles | 第26-27页 |
| 2.4 Previous Empirical Studies on Lexical Bundles | 第27-31页 |
| 2.4.1 Overseas Studies on Lexical Bundles | 第27-29页 |
| 2.4.2 Domestic Studies on Lexical Bundles | 第29-31页 |
| 2.5 Theoretical Foundation of the Study | 第31-33页 |
| CHAPTER Ⅲ RESEARCH METHODOLOGY | 第33-38页 |
| 3.1 Source of the Corpora | 第33-34页 |
| 3.2 Software used in the Study | 第34页 |
| 3.3 Research Procedures | 第34-38页 |
| 3.3.1 Data Collection | 第35页 |
| 3.3.2 Measurement Tool | 第35-36页 |
| 3.3.3 Procedures of Data Analysis | 第36-38页 |
| CHAPTER ⅣDATA ANALYSIS AND FINDINGS | 第38-63页 |
| 4.1 General Distribution of Lexical bundles in Two Corpora | 第38-42页 |
| 4.1.1 Structural Classification of Lexical Bundles in the Two Corpora | 第39-40页 |
| 4.1.2 Functional Distribution of Lexical Bundles in the Two Corpora | 第40-42页 |
| 4.2 The Features of Lexical Bundles in AER Corpus | 第42-48页 |
| 4.2.1 Structural Features of Lexical Bundles in AER Corpus | 第42-45页 |
| 4.2.2 Functional Features of Lexical Bundles in AER Corpus | 第45-48页 |
| 4.3 The Features of Lexical Bundles in CWE Corpus | 第48-54页 |
| 4.3.1 Structural Features of Lexical Bundles in CWE Corpus | 第48-51页 |
| 4.3.2 Functional Features of Lexical Bundles in CWE Corpus | 第51-54页 |
| 4.4 Comparative Analysis of Lexical Bundles in the Two Corpora | 第54-61页 |
| 4.4.1 Comparative Analysis of Structural Distribution of Lexical Bundles in theTwo Corpora | 第54-57页 |
| 4.4.2 Comparative Analysis of Functional Distribution of Lexical Bundles inthe Two Corpora | 第57-61页 |
| 4.5 Summary | 第61-63页 |
| CHAPTER ⅤCONCLUSION | 第63-67页 |
| 5.1 Major Findings | 第63-65页 |
| 5.2 Implications and Suggestions for Further Study | 第65页 |
| 5.3 Limitations of the Study | 第65-67页 |
| BIBLIOGRAPHY | 第67-70页 |
| Appendix 1 List of Structural Classification of Lexical Bundles in AER | 第70-74页 |
| Appendix 2 List of Functional Classification of Lexical Bundles in AER | 第74-78页 |
| Appendix 3 Structural Classification of Lexical Bundles in CWE | 第78-80页 |
| Appendix 4 List of Functional Classification of Lexical Bundles in CWE | 第80-81页 |
