| Acknowledgments | 第5-6页 |
| 摘要 | 第6-7页 |
| Abstract | 第7-8页 |
| List of Abbreviations | 第11-12页 |
| List of Tables and Figures | 第12-13页 |
| Chapter 1 Introduction | 第13-17页 |
| 1.1 Background of the Study | 第13-14页 |
| 1.2 Significance of the Study | 第14-15页 |
| 1.3 Purpose of the Study | 第15页 |
| 1.4 Organization of the Thesis | 第15-17页 |
| Chapter 2 Literature Review AND THEORITICAL FRAMEWORK | 第17-30页 |
| 2.1 Lexical Chunks | 第17-25页 |
| 2.1.1 Definitions of Lexical Chunks | 第17-18页 |
| 2.1.2 Classifications of Lexical Chunks | 第18-21页 |
| 2.1.3 Foreign and Domestic Studies of Lexical Chunks | 第21-23页 |
| 2.1.4 Lexical Chunks in Second Language Acquisition | 第23页 |
| 2.1.5 Lexical Chunks in Academic Writing | 第23-25页 |
| 2.2 Corpus and Corpus linguistics | 第25-28页 |
| 2.2.1 Definitions and Significance of Corpus | 第25-26页 |
| 2.2.2 Definitions and features of Corpus linguistics | 第26-27页 |
| 2.2.3 Relevant studies on creating word or lexical chunk list | 第27-28页 |
| 2.3 Limitations of the Previous Studies | 第28-30页 |
| Chapter 3 Research Design | 第30-39页 |
| 3.1 Research Questions | 第30页 |
| 3.2 Research Methods | 第30-31页 |
| 3.3 Research instruments | 第31-34页 |
| 3.3.1 Corpora | 第31-34页 |
| 3.3.2 AntConc | 第34页 |
| 3.4 Research Procedures | 第34-39页 |
| 3.4.1 Determine the Target Corpus | 第34-36页 |
| 3.4.2 Set the selection criteria | 第36-37页 |
| 3.4.3 Use software to select lexical chunks based on the selection criteria | 第37-38页 |
| 3.4.4 Data Collection and Analysis | 第38-39页 |
| Chapter 4 Results and Discussion | 第39-60页 |
| 4.1 Establishment of MLCL | 第39-44页 |
| 4.1.1 The Most Frequently Used Lexical Chunks | 第39页 |
| 4.1.2 Validity Discussion of MLCL | 第39-44页 |
| 4.2 A Simple Comparison of Lexical Chunks in MLCL and AFL | 第44-51页 |
| 4.2.1 The Similarities between MLCL and AFL | 第44-48页 |
| 4.2.2 The Differences between MLCL and AFL | 第48-51页 |
| 4.3 The Most Obvious Features of MELC | 第51-60页 |
| 4.3.1 Distinct Medical Disciplinary Features | 第51-53页 |
| 4.3.2 Distinct Features of Structural Distribution of Lexical Chunks | 第53-55页 |
| 4.3.3 Distinct Features of Functional Distribution of Lexical Chunks | 第55-60页 |
| Chapter 5 Conclusion | 第60-66页 |
| 5.1 A Summary of the Study | 第60-61页 |
| 5.2 Major Findings | 第61-62页 |
| 5.3 Limitations of the Study | 第62页 |
| 5.4 Implications | 第62-64页 |
| 5.5 Suggestions for Further Studies | 第64-66页 |
| Bibliography | 第66-72页 |
| Appendix I Medical Lexical Chunks List | 第72-78页 |
| Appendix II: Structural categorization of MLCL | 第78-80页 |
| Appendix III Structural categorization of AFL | 第80-81页 |
| Appendix IV: Functional categorization of AFL | 第81-83页 |
| Appendix V: Functional categorization of MLCL | 第83-85页 |
| Paper published during the study for M. A. Degree | 第85页 |
