| Acknowledgements | 第4-5页 |
| Abstract | 第5-6页 |
| 摘要 | 第7-14页 |
| Chapter One Introduction | 第14-20页 |
| 1.1 Background of the Study | 第14-16页 |
| 1.2 Significance of the Study | 第16-17页 |
| 1.3 Purposes of the Study | 第17-18页 |
| 1.4 Overall Structure of the Thesis | 第18-20页 |
| Chapter Two Literature Review | 第20-42页 |
| 2.1 Research on the PBL Teaching Method | 第20-30页 |
| 2.1.1 Theoretical Research on the PBL Teaching Method | 第20-27页 |
| 2.1.2 Empirical Research on the PBL Teaching Method | 第27-29页 |
| 2.1.3 Comments and Drawbacks of the Previous Research | 第29-30页 |
| 2.2 Research on the Academic English Vocabulary | 第30-38页 |
| 2.2.1 Definition of Academic Vocabulary | 第30页 |
| 2.2.2 Research on Academic Vocabulary Acquisition | 第30-32页 |
| 2.2.3 Dimensions for Lexical Diversity | 第32-36页 |
| 2.2.4 Research on the Application of the PBL Teaching Method to Academic Vocabulary Acquisition | 第36-37页 |
| 2.2.5 Comments and Drawbacks of the Previous Research | 第37-38页 |
| 2.3 Research on Reporting Verbs | 第38-41页 |
| 2.3.1 Definition of Reporting Verbs | 第38-39页 |
| 2.3.2 Research on the Diversity of Reporting Verbs | 第39-41页 |
| 2.3.3 Comments and Drawbacks of the Previous Research | 第41页 |
| 2.4 Summary | 第41-42页 |
| Chapter Three Methodology | 第42-53页 |
| 3.1 Research Rationale | 第42页 |
| 3.2 Research Questions | 第42-43页 |
| 3.3 Research Participants | 第43-45页 |
| 3.4 Instruments | 第45-51页 |
| 3.5 Data Collection | 第51-52页 |
| 3.6 Data Analysis | 第52页 |
| 3.7 Summary | 第52-53页 |
| Chapter Four Results and Discussion | 第53-71页 |
| 4.1 Results and Discussion of the Effects of Time on the Change of Lexical Diversity | 第53-60页 |
| 4.1.1 Results of the Effects of Time on the Change of Lexical Density | 第53-55页 |
| 4.1.2 Results of the Effects of Time on the Change of Lexical Complexity | 第55-58页 |
| 4.1.3 Discussion | 第58-60页 |
| 4.2 Results and Discussion of the Effects of Teaching Method on the Change of Lexical Diversity | 第60-64页 |
| 4.2.1 Results of the Effects of Teaching Method on the Change of LexicalDensity | 第60-61页 |
| 4.2.2 Results of the Effects of Teaching Method on the Change of Lexical Complexity | 第61-63页 |
| 4.2.3 Discussion | 第63-64页 |
| 4.3 Results and Discussion of the Interaction Effects of the Time and Teaching Method on the Change of Lexical Diversity | 第64-70页 |
| 4.3.1 Results and Discussion of the Interaction Effects of the Time and Teaching Method on the Change of Lexical Density | 第65-66页 |
| 4.3.2 Results and Discussion of the Interaction Effects of the Time and Teaching Method on the Change of Lexical Complexity | 第66-68页 |
| 4.3.3 Discussion | 第68-70页 |
| 4.4 Summary | 第70-71页 |
| Chapter Five Conclusions | 第71-75页 |
| 5.1 Major Findings | 第71-73页 |
| 5.2 Implications | 第73页 |
| 5.3 Limitations | 第73-74页 |
| 5.4 Suggestions for Further Study | 第74-75页 |
| References | 第75-81页 |
| Appendix I Academic Vocabulary Test | 第81-84页 |
| Appendix II Pre-test | 第84-85页 |
| Appendix III Mid-test | 第85-86页 |
| Appendix IV Post-test | 第86-87页 |
| Appendix V Questions of the Retrospective Interview | 第87-88页 |
