| Acknowledgements | 第1-5页 |
| Abstract | 第5-7页 |
| 摘要 | 第7-9页 |
| Contents | 第9-12页 |
| Tables and figures | 第12-14页 |
| Abbreviations | 第14-15页 |
| Chapter One Introduction | 第15-20页 |
| ·English learning in China | 第15-16页 |
| ·Research questions | 第16-17页 |
| ·Significance of the study | 第17-18页 |
| ·Organization of the thesis | 第18-20页 |
| Chapter Two Literature Review | 第20-38页 |
| ·Definition of language attrition | 第20-22页 |
| ·A typology of language attrition in research | 第22-24页 |
| ·Language attrition research focused on language | 第24-31页 |
| ·The Linguistic Feature Hypothesis | 第24-25页 |
| ·The Regression Hypothesis | 第25-26页 |
| ·Language skills affected in attrition | 第26-31页 |
| ·Influential studies on the attrition of lexical knowledge | 第26-28页 |
| ·Disparity concerning the attrition of lexical knowledge | 第28-31页 |
| ·Language attrition focused on the individual | 第31-38页 |
| ·The Inverse Hypothesis | 第31-32页 |
| ·The Critical Threshold Hypothesis | 第32页 |
| ·Individual factors investigated in the Study of L2 Attrition | 第32-38页 |
| ·Initial proficiency level | 第32-34页 |
| ·Attitudes and motivation | 第34-38页 |
| Chapter Three Methodology | 第38-44页 |
| ·Research design: an overview | 第38页 |
| ·Subjects | 第38-39页 |
| ·Instruments | 第39-41页 |
| ·Reliability analysis of the instruments | 第41-42页 |
| ·Data collection | 第42-43页 |
| ·Data analysis | 第43-44页 |
| Chapter Four Results | 第44-62页 |
| ·Descriptive data | 第44-47页 |
| ·Baseline data | 第44-47页 |
| ·Instrumental and integrative motivations | 第44-45页 |
| ·Motivational intensity | 第45页 |
| ·Proficiency test: Analysis of test scores | 第45-47页 |
| ·Data at Time 2: Proficiency test scores | 第47页 |
| ·Group differences between scores of proficiency tests at Time 1 and Time 2 | 第47-48页 |
| ·Within-group differences between scores of proficiency tests at Time 1 and Time 2 | 第48-50页 |
| ·The association between language attrition and initial proficiency | 第50-51页 |
| ·The association between language attrition and motivation | 第51-52页 |
| ·The effects of individual factors on lexical attrition: GLM analysis | 第52-56页 |
| ·The effects of individual factors on grammar attrition: GLM analysis | 第56-58页 |
| ·Attrition of lexicon by proficiency levels | 第58-62页 |
| Chapter Five Discussions and Conclusion | 第62-74页 |
| ·Discussions | 第62-67页 |
| ·Linguistic skills affected after six months of disuse | 第62-64页 |
| ·Initial proficiency as a predictor of attrition | 第64-66页 |
| ·Motivation as a predictor of attrition | 第66-67页 |
| ·Implications | 第67-69页 |
| ·Limitations and suggestions for future study | 第69-72页 |
| ·Conclusion | 第72-74页 |
| Bibliography | 第74-81页 |
| Appendices | 第81-90页 |
| Appendix A | 第81-83页 |
| Appendix B | 第83-86页 |
| Appendix C | 第86-89页 |
| Appendix D | 第89-90页 |
| Publications | 第90页 |
| 攻读学位期间发表的学术论文目录 | 第90页 |
