| Acknowledgements | 第4-5页 |
| Abstract | 第5-7页 |
| 摘要 | 第8-10页 |
| Table of Contents | 第10-12页 |
| List of Tables | 第12-13页 |
| Chapter One Introduction | 第13-17页 |
| 1.1 General description of the study | 第13-14页 |
| 1.2 Motivations for the study | 第14-15页 |
| 1.3 Significance of the study | 第15页 |
| 1.4 Overall structure of the thesis | 第15-17页 |
| Chapter Two Literature Review | 第17-47页 |
| 2.1 Key terms in this study | 第17-22页 |
| 2.1.1 Incidental vocabulary acquisition | 第17-18页 |
| 2.1.2 Incidental acquisition of text content | 第18-19页 |
| 2.1.3 Imitative writing | 第19-20页 |
| 2.1.4 Back-translation | 第20-22页 |
| 2.2 Theoretical foundations in this study | 第22-29页 |
| 2.2.1 Krashen's Input Hypothesis | 第22-24页 |
| 2.2.2 Swain's Output Hypothesis | 第24-26页 |
| 2.2.3 Memetics | 第26-27页 |
| 2.2.4 Principle of equal inferential distance in translating | 第27-29页 |
| 2.3 Previous studies | 第29-47页 |
| 2.3.1 Previous studies on back-translation | 第29-35页 |
| 2.3.2 Previous studies on incidental vocabulary acquisition | 第35-45页 |
| 2.3.2.1 Previous studies on effects of reading on incidental vocabulary acquisition | 第35-39页 |
| 2.3.2.2 Previous studies on effects of writing on incidental vocabulary acquisition | 第39-40页 |
| 2.3.2.3 Previous studies on effects of listening and speaking on incidental vocabulary acquisition | 第40-42页 |
| 2.3.2.4 Previous studies on effects of annotation on incidental vocabulary acquisition | 第42-45页 |
| 2.3.3 Previous studies on incidental acquisition of text content | 第45-47页 |
| Chapter Three Methodology | 第47-59页 |
| 3.1 Research questions | 第47页 |
| 3.2 Research design | 第47-59页 |
| 3.2.1 Participants | 第47-49页 |
| 3.2.2 Description of the experimental material in this study | 第49-50页 |
| 3.2.3 Treatment | 第50-52页 |
| 3.2.4 Instruments | 第52-53页 |
| 3.2.5 Data collection | 第53-54页 |
| 3.2.6 Data Analysis | 第54-59页 |
| 3.2.6.1 Scoring | 第54-58页 |
| 3.2.6.2 Independent-samples t-test | 第58页 |
| 3.2.6.3 Calculating the retention rate | 第58-59页 |
| Chapter Four Results and Discussion | 第59-65页 |
| 4.1 Results of this study | 第59-62页 |
| 4.1.1 Effects of different learning tasks on immediate test of incidental acquisition of text content | 第59页 |
| 4.1.2 Effects of different learning tasks on delayed test of incidental acquisition of text content | 第59-60页 |
| 4.1.3 Retention rate of incidental acquisition of text content in the delayed test in terms of tw | 第60-62页 |
| 4.2 Discussion of the results of this study | 第62-65页 |
| 4.2.1 Discussion of effects of different learning tasks on incidental acquisition of text content | 第62-63页 |
| 4.2.2 Discussion of retention rate of incidental acquisition of text content in two different learning tasks | 第63-65页 |
| Chapter Five Conclusion | 第65-68页 |
| 5.1 Major findings | 第65-66页 |
| 5.2 Pedagogical implications | 第66页 |
| 5.3 Limitations and suggestions for further studies | 第66-68页 |
| References | 第68-72页 |
| Appendixes | 第72-75页 |
| Appendix Ⅰ: Model text | 第72-73页 |
| Appendix Ⅱ: Immediate test and delayed test | 第73-74页 |
| Appendix Ⅲ: Rating Criterion | 第74-75页 |
