| 摘要 | 第4-5页 |
| Abstract | 第5-6页 |
| Chapter One Introduction | 第10-13页 |
| 1.1 Research Background | 第10-11页 |
| 1.2 Objectives of the Study | 第11页 |
| 1.3 Significance of Research | 第11-12页 |
| 1.4 Structure of This Thesis | 第12-13页 |
| Chapter Two Literature Review | 第13-26页 |
| 2.1 General Description of SLA | 第13-21页 |
| 2.1.1 The Definition of SLA | 第13-14页 |
| 2.1.2 Research Methods of SLA | 第14-21页 |
| 2.2 Factors Affecting Second Language Learning | 第21-26页 |
| 2.2.1 Linguistic Factors | 第22页 |
| 2.2.2 Individual Factors of Learners | 第22-23页 |
| 2.2.3 External Factors of Learners | 第23-24页 |
| 2.2.4 Cognitive Factors | 第24页 |
| 2.2.5 Transfer Factors | 第24-26页 |
| Chapter Three Theoretical Framework | 第26-41页 |
| 3.1 Critical Period Hypothesis | 第26-35页 |
| 3.1.1 The Proposal of the Critical Period Hypothesis | 第26-30页 |
| 3.1.2 The Basis for the Existence of the Critical Period Hypothesis | 第30-33页 |
| 3.1.3 The Dispute over the Critical Period Hypothesis | 第33-35页 |
| 3.1.4 The Characteristics of Critical Period Hypothesis in English Learning | 第35页 |
| 3.2 Different Understandings of the Critical Period of Language Acquisition | 第35-41页 |
| 3.2.1 View of Penfield and Roberts | 第35-36页 |
| 3.2.2 Views of Lenneberg | 第36-37页 |
| 3.2.3 Views of Krashen | 第37-38页 |
| 3.2.4 Views of Gui Shichun | 第38-39页 |
| 3.2.5 Views of Steinberg | 第39-40页 |
| 3.2.6 View of other Scholars | 第40-41页 |
| Chapter Four Research Methodology | 第41-48页 |
| 4.1 Research Questions | 第41页 |
| 4.2 Subjects | 第41-42页 |
| 4.3 Instruments | 第42页 |
| 4.4 Data Collection | 第42-47页 |
| 4.4.1 Data Collection of the Case | 第42-44页 |
| 4.4.2 Data Collection of a Test | 第44-45页 |
| 4.4.3 Date Collection of a Questionnaire | 第45-47页 |
| 4.5 Summary | 第47-48页 |
| Chapter Five Results and Discussions | 第48-60页 |
| 5.1 Results and Analysis of the Study | 第48-51页 |
| 5.1.1 Results and Analysis of the Case | 第48-49页 |
| 5.1.2 Results and Analysis of the Test | 第49-50页 |
| 5.1.3 Results and Analysis of the Questionnaire | 第50-51页 |
| 5.2 Discussions | 第51-60页 |
| 5.2.1 The Influence of Age on Second Language Acquisition | 第51-55页 |
| 5.2.2 Explanations for the Effects of Age in Second Language Acquisition | 第55-57页 |
| 5.2.3 Differences between Children and Adult in Learning Foreign Languages | 第57-60页 |
| Chapter Six Conclusion | 第60-65页 |
| 6.1 The Limitations of Learning Second Language for Learners of Different Ages | 第60-62页 |
| 6.1.1. Children (3-10 years old) | 第60-61页 |
| 6.1.2. Teenagers (11-17 years old) | 第61页 |
| 6.1.3. Adults (over 18 years of age) | 第61-62页 |
| 6.2 Some Suggestions on the Influence of Age on Second Language Acquisition | 第62-65页 |
| 6.2.1 Suggestions for Children's Teaching | 第63页 |
| 6.2.2 Suggestions for Adult Teaching | 第63-65页 |
| References | 第65-69页 |
| Acknowledgements | 第69-70页 |
| 作者简介 | 第70页 |
