| 摘要 | 第5-6页 |
| Abstract | 第6-7页 |
| Part One Introduction | 第12-17页 |
| 1.1 Research Background | 第12-14页 |
| 1.2 Significance of the Study | 第14-15页 |
| 1.2.1 Theoretical Significances | 第14-15页 |
| 1.2.2 Practical Significances | 第15页 |
| 1.3 Organization of the Thesis | 第15-17页 |
| Part Two Literature Review | 第17-31页 |
| 2.1 Definition and Typology of Language Attrition | 第17-20页 |
| 2.1.1 Definition of Language Attrition | 第17-19页 |
| 2.1.2 Types of Language Attrition | 第19-20页 |
| 2.2 Theories in Second Language Attrition | 第20-22页 |
| 2.2.1 Regression Hypothesis | 第20页 |
| 2.2.2 Retrieval Failure Hypothesis | 第20-21页 |
| 2.2.3 The Savings Paradigm Hypothesis | 第21-22页 |
| 2.2.4 The Relearning Hypothesis | 第22页 |
| 2.3 Variables Affecting Second Language Attrition | 第22-30页 |
| 2.3.1 Initial Proficiency | 第23-25页 |
| 2.3.2 Exposure to the Attrited Language | 第25-27页 |
| 2.3.3 Other Variables Affecting Second Language Attrition | 第27-30页 |
| 2.4 Language Skills Affected in Second Language Attrition | 第30-31页 |
| Part Three Methodologies | 第31-37页 |
| 3.1 Research Design | 第31页 |
| 3.2 Research Questions | 第31-32页 |
| 3.3 Subjects | 第32页 |
| 3.4 Instruments | 第32-35页 |
| 3.4.1 The Questionnaire | 第33-34页 |
| 3.4.2 Language Proficiency Test | 第34-35页 |
| 3.5 Data Collection and Analysis | 第35-37页 |
| 3.5.1 Data Collection | 第35页 |
| 3.5.2 Data Analysis | 第35-37页 |
| Part Four Results and Discussions | 第37-55页 |
| 4.1 Language Attrition after Termination of English Formal Study for Four Years | 第37-42页 |
| 4.1.1 Differences between CET Scores at Time 1 and Time2 | 第37-39页 |
| 4.1.2 Receptive Skills Suffering More Attrition | 第39-42页 |
| 4.2 The Relationship between Initial Proficiency and Language Attrition | 第42-51页 |
| 4.2.1 Differences between CET Scores at Time 1 and Time2 in High Proficiency Group | 第42-44页 |
| 4.2.2 Differences between CET Scores at Time 1 and Time2 in Low Proficiency Group | 第44-46页 |
| 4.2.3 Comparison between High Proficiency Group and Low Proficiency Group | 第46-49页 |
| 4.2.4 Reasons for the Differences between Two Groups | 第49-51页 |
| 4.3 The rel ationship between the Exposure to Language and Language Attrition | 第51-55页 |
| 4.3.1 Types and Amount of English Use | 第51-53页 |
| 4.3.2 Correlation between Exposure to the Attrited Language and Language Attrition | 第53-55页 |
| Chapter Five Conclusions | 第55-59页 |
| 5.1 Major Findings | 第55-56页 |
| 5.2 Implications | 第56-57页 |
| 5.3 Limitations and Suggestions for Further Study | 第57-59页 |
| References | 第59-62页 |
| Appendix Ⅰ | 第62-64页 |
| Appendix Ⅱ | 第64-74页 |
| Acknowledgements | 第74-75页 |
| 个人简历 | 第75页 |
| 攻读硕士期间发表论文情况 | 第75-76页 |
