| 摘要 | 第5-6页 |
| Abstract | 第6-7页 |
| Content | 第8-11页 |
| Chapter One Introduction | 第11-16页 |
| 1.1 Research Ground | 第11-13页 |
| 1.2 Research Objectives | 第13页 |
| 1.3 Research Methodology | 第13页 |
| 1.4 Significance of Study | 第13-14页 |
| 1.5 Organization of Thesis | 第14-16页 |
| Chapter Two Literature Review | 第16-35页 |
| 2.1 A Review of Some Hypotheses Concerning Language Attrition | 第16-20页 |
| 2.1.1 The Inverse Hypothesis | 第16页 |
| 2.1.2 The Regression Hypothesis | 第16-18页 |
| 2.1.3 The Critical Threshold Hypothesis and the Activation Threshold Hypothesis | 第18-19页 |
| 2.1.4 The Linguistic Features Hypothesis | 第19页 |
| 2.1.5 The Interface Hypothesis | 第19-20页 |
| 2.2 Extralinguistic Factors Influencing the Process of Attrition | 第20-24页 |
| 2.2.1 Personal Factors | 第20-22页 |
| 2.2.1.1 Attained Proficiency | 第20-21页 |
| 2.2.1.2 Age at Onset of Attrition | 第21-22页 |
| 2.2.1.3 Attitude and Motivation | 第22页 |
| 2.2.2 External Factors | 第22-24页 |
| 2.2.2.1 Length of Exposure | 第22-23页 |
| 2.2.2.2 Contact with the Language | 第23页 |
| 2.2.2.3 Typological Proximity of Languages | 第23-24页 |
| 2.3 A Review of Studies on Lexical Attrition | 第24-29页 |
| 2.3.1 Studies on Lexical Attrition Abroad | 第24-28页 |
| 2.3.1.1 Lexical Attrition and Other Linguistic Aspects | 第24-26页 |
| 2.3.1.2 Some Lexical Features Influencing the Process of Lexical Attrition | 第26-27页 |
| 2.3.1.3 Attrition in Receptive and Productive Vocabulary | 第27-28页 |
| 2.3.2 Studies on Lexical Attrition Home | 第28-29页 |
| 2.4 A Review of Studies on Word Concreteness | 第29-35页 |
| 2.4.1 Concreteness Effect and Imageability | 第29-30页 |
| 2.4.2 Studies on Word Concreteness | 第30-32页 |
| 2.4.3 Three Hypotheses of Concreteness Effect | 第32-35页 |
| 2.4.3.1 Dual-coding Theory | 第32-33页 |
| 2.4.3.2 Context Availability Theory | 第33页 |
| 2.4.3.3 Semantic Representation Theory | 第33-35页 |
| Chapter Three Methodology | 第35-42页 |
| 3.1 Research Questions | 第35-36页 |
| 3.2 Participants | 第36-37页 |
| 3.3 Instruments | 第37-39页 |
| 3.3.1 Select Words Test | 第37-38页 |
| 3.3.2 Background Questionnaire | 第38-39页 |
| 3.4 Data Collection | 第39-40页 |
| 3.5 Data Analysis | 第40-42页 |
| Chapter Four Data Analysis and Discussion | 第42-55页 |
| 4.1 The Relationship Between Lexical Attrition and Word Concreteness | 第42-50页 |
| 4.1.1 Analysis of Differences Between Select Words Test Scores as a Whole at Time 1 and Time | 第42-44页 |
| 4.1.2 Analysis of Differences Between Scores of Concrete words at Time 1 and Time | 第44-46页 |
| 4.1.3 Analysis of Differences Between Scores of Abstract Words at Time 1 and Time | 第46-47页 |
| 4.1.4 Analysis of Differences Between Attrited Concrete Words and Attrited Abstract Words | 第47-50页 |
| 4.2 The Relationship Between Lexical Attrition and FL Proficiency | 第50-54页 |
| 4.2.1 Analysis of the Correlation Between the FL Proficiency and Words Attrition as a Whole | 第50-52页 |
| 4.2.2 Analysis of the Correlation Between the Attrition of Concrete Words and FL Proficiency | 第52-53页 |
| 4.2.3 Analysis of the Correlation Between the Attrition of Abstract Words and FL Proficiency | 第53-54页 |
| 4.3 Summary | 第54-55页 |
| Chapter Five Conclusion | 第55-59页 |
| 5.1 Major Finings | 第55-56页 |
| 5.2 Implications | 第56-57页 |
| 5.3 Limitations and Suggestions for Further Study | 第57-59页 |
| Bibliography | 第59-64页 |
| Appendix A | 第64-65页 |
| Appendix B | 第65-66页 |
| Acknowledgements | 第66-67页 |
| 个人简历 | 第67页 |
| 攻读硕士期间发表学术论文情况 | 第67-68页 |
