| 中文摘要 | 第1-6页 |
| ABSTRACT | 第6-11页 |
| List of Abbreviations | 第11-13页 |
| Introduction | 第13-17页 |
| ·Background of the Research | 第13-14页 |
| ·Significance and Purpose of the Research | 第14-15页 |
| ·Organization of the Thesis | 第15-17页 |
| Chapter II Literature Review | 第17-42页 |
| ·Conceptual definitions of key terms | 第17-25页 |
| ·Language Attrition | 第17-19页 |
| ·Language Maintenance | 第19页 |
| ·Language Input & Language Output | 第19-21页 |
| ·Interactional Input Enhancement | 第21页 |
| ·Output-oriented English Teaching | 第21-23页 |
| ·Learning Autonomy | 第23-25页 |
| ·The development of language attrition studies | 第25-31页 |
| ·The beginning (or primary) stage of language attrition studies | 第25-27页 |
| ·The developmental stage of language attrition studies | 第27-28页 |
| ·The present stage of language attrition studies abroad | 第28-31页 |
| ·The present studies of language attrition in China | 第31页 |
| ·The property of language attrition | 第31-33页 |
| ·The classification of language attrition | 第33-34页 |
| ·Factors affecting FL attrition | 第34-40页 |
| ·Some individual factors | 第35-38页 |
| ·Some social factors | 第38-40页 |
| ·Relations between language attrition and language acquisition | 第40-41页 |
| ·Relevant studies of vocabulary attrition in the West and China | 第41-42页 |
| Chapter III Methodology | 第42-49页 |
| ·Research questions | 第42-43页 |
| ·Research design | 第43-44页 |
| ·Research subjects | 第44-45页 |
| ·Research instruments | 第45-48页 |
| ·Lexical test paper | 第45-46页 |
| ·Questionnaire | 第46-47页 |
| ·Semi-structured interview | 第47页 |
| ·SPSS 19.0 | 第47-48页 |
| ·Procedure of data collection | 第48-49页 |
| Chapter IV Data Analysis and Discussion | 第49-83页 |
| ·Analysis of the English vocabulary attrition of Mongolian senior students | 第49-53页 |
| ·Analysis of the affecting factors of the English vocabulary attrition of Mongolian senior students | 第53-75页 |
| ·The individual factors | 第53-64页 |
| ·The social factors | 第64-75页 |
| ·A discussion of the enlightenment forEnglish learning and teaching | 第75-83页 |
| ·Enlightenment for enhancing English maintenance | 第75-79页 |
| ·Enlightenment for improving English teaching | 第79-83页 |
| Conclusion | 第83-88页 |
| ·Summary of major findings | 第83-86页 |
| ·Limitations of the research | 第86-87页 |
| ·Recommendations for future research | 第87-88页 |
| Bibliography | 第88-90页 |
| Appendix I | 第90-98页 |
| Appendix II | 第98-101页 |
| Appendix III | 第101-102页 |
| Appendix IV | 第102-107页 |
| Acknowledgements | 第107-108页 |
| Publications during the Postgraduate Program | 第108页 |
