| ACKNOWLEDGEMENTS | 第5-6页 |
| ABSTRACT | 第6-8页 |
| 摘要 | 第9-16页 |
| LIST OF ABBREVIATIONS | 第16-20页 |
| Chapter One INTRODUCTION | 第20-24页 |
| 1.1 Motivation of the Study | 第20-21页 |
| 1.2 Significance of the Study | 第21-22页 |
| 1.3 Structure of the Thesis | 第22-24页 |
| Chapter Two LITERATURE REVIEW | 第24-40页 |
| 2.1 Basic Concepts Related with Vowels | 第24-29页 |
| 2.1.1 English Vowels | 第24-27页 |
| 2.1.2 Mandarin Vowels | 第27-29页 |
| 2.2 Relevant Theoretical Studies | 第29-35页 |
| 2.2.1 Contrastive Analysis Hypothesis | 第29-30页 |
| 2.2.2 Theoretical Models of Second-Language Speech Learning | 第30-35页 |
| 2.3 Relevant Empirical Studies | 第35-38页 |
| 2.3.1 Effect of Native Language on Second Language Learning | 第35-37页 |
| 2.3.2 Role of Second-Language Experience | 第37-38页 |
| 2.4 Focus of the Present Study | 第38-40页 |
| Chapter Three METHODOLOGY | 第40-50页 |
| 3.1 Research Questions | 第40页 |
| 3.2 Subjects | 第40-41页 |
| 3.3 Materials | 第41-43页 |
| 3.4 Procedures | 第43-47页 |
| 3.4.1 Assimilation Experiment | 第44-45页 |
| 3.4.2 Discrimination Experiment | 第45-46页 |
| 3.4.3 Identification Experiment | 第46-47页 |
| 3.4.4 Production Experiment | 第47页 |
| 3.5 Data Analysis | 第47-50页 |
| Chapter Four RESULTS AND DISCUSSION | 第50-102页 |
| 4.1 Assimilation of English Vowels by Chinese EFL Learners | 第50-57页 |
| 4.1.1 Assimilation by the LE Group | 第50-53页 |
| 4.1.2 Assimilation by the HE Group | 第53-55页 |
| 4.1.3 Relation between English Experience and Assimilation Performance | 第55-56页 |
| 4.1.4 Discussion | 第56-57页 |
| 4.2 Discrimination of English Vowels by Chinese EFL Learners | 第57-62页 |
| 4.2.1 Discrimination by the LE Group | 第57-58页 |
| 4.2.2 Discrimination by the HE Group | 第58-59页 |
| 4.2.3 Relation between English Experience and Discrimination Performance | 第59-60页 |
| 4.2.4 Relation between Assimilation and Discrimination | 第60-61页 |
| 4.2.5 Discussion | 第61-62页 |
| 4.3 Identification of English Vowels by Chinese EFL Learners | 第62-70页 |
| 4.3.1 Identification by the LE Group | 第62-64页 |
| 4.3.2 Identification by the HE Group | 第64-66页 |
| 4.3.3 Relation between English Experience and Identification Performance | 第66-67页 |
| 4.3.4 Relation between Assimilation and Identification | 第67-68页 |
| 4.3.5 Relation between Identification and Discrimination | 第68-70页 |
| 4.3.6 Discussion | 第70页 |
| 4.4 Production of English Vowels by Chinese EFL Learners | 第70-102页 |
| 4.4.1 Acoustic Analysis of Native Mandarin Vowels and Mandarin-accented English Vowels | 第72-81页 |
| 4.4.2 Acoustic Analysis of Native English Vowels and Mandarin-accented English Vowels | 第81-96页 |
| 4.4.3 Discussion | 第96-102页 |
| Chapter Five CONCLUSION | 第102-108页 |
| 5.1 Major Findings | 第102-105页 |
| 5.2 Implications | 第105-106页 |
| 5.3 Limitations and Suggestions | 第106-108页 |
| REFERENCES | 第108-116页 |
| PUBLISHED PAPERS | 第116-118页 |
| APPENDIX | 第118-121页 |
