| ACKNOWLEDGEMENTS | 第5-6页 |
| ABSTRACT | 第6-7页 |
| 摘要 | 第8-14页 |
| CHAPTER ONE INTRODUCTION | 第14-29页 |
| 1.1 Research Background | 第14-16页 |
| 1.2 Operational Definitions | 第16-26页 |
| 1.2.1 Terminological Variation from Functional Aspect | 第16-17页 |
| 1.2.2 Terminology | 第17-23页 |
| 1.2.3 Doublespeak | 第23-26页 |
| 1.2.4 Environmental Discourses | 第26页 |
| 1.3 Significance of the Research | 第26-27页 |
| 1.3.1 Theoretical Significance | 第26-27页 |
| 1.3.2 Practical Significance | 第27页 |
| 1.4 Research Questions | 第27-28页 |
| 1.5 Organization of the Thesis | 第28-29页 |
| CHAPTER TWO LITERATURE REVIEW | 第29-35页 |
| 2.1 Previous Studies on Terminological Variation from Functional Aspect | 第29-32页 |
| 2.2 Previous Studies on Terms in Environmental Discourse | 第32-33页 |
| 2.3 Previous Studies on Sustainability Reports | 第33-34页 |
| 2.4 Summary | 第34-35页 |
| CHAPTER THREE THEORETICAL FRAMEWORK | 第35-41页 |
| 3.1 Three Key Notions of Adaptation Theory | 第35-36页 |
| 3.1.1 Variability | 第35-36页 |
| 3.1.2 Negotiability | 第36页 |
| 3.1.3 Adaptability | 第36页 |
| 3.2 Four Tasks of Adaptation Theory | 第36-39页 |
| 3.2.1 Contextual Correlates of Adaptability | 第37-38页 |
| 3.2.2 Structural Objects of Adaptability | 第38页 |
| 3.2.3 Dynamics of Adaptability | 第38-39页 |
| 3.2.4 Salience of the Adaptability Process | 第39页 |
| 3.3 Summary | 第39-41页 |
| CHAPTER FOUR DATA COLLECTION | 第41-46页 |
| 4.1 Reason for Choosing Shell Corporation in Oil Industry | 第41-42页 |
| 4.2 Reason for Selecting Sustainability Reports | 第42-43页 |
| 4.3 Process of Term Extraction | 第43-46页 |
| CHAPTER FIVE ANALYSIS OF TERMINOLOGICAL VARIATION FROM FUNCTIONAL ASPECT | 第46-75页 |
| 5.1 Identification of Terminological Variation from Functional Aspect | 第46-52页 |
| 5.1.1 Method of Identifying Performing Functions of Terms in Shell’s Report | 第49-50页 |
| 5.1.2 Findings in Shell’s Sustainability Report | 第50-52页 |
| 5.2 Categories of Terms Used as Doublespeak | 第52-69页 |
| 5.2.1 The Hidden Trade-off | 第52-58页 |
| 5.2.2 Vagueness | 第58-64页 |
| 5.2.3 Lesser of Two Evils | 第64-69页 |
| 5.3 The Characteristics of Terms Used as Doublespeak | 第69-71页 |
| 5.3.1 Reliability on Context | 第69-70页 |
| 5.3.2 The Mismatch between Concept and Designative meaning | 第70-71页 |
| 5.4 Adaptability of Terminological Variation from Functional Aspect | 第71-75页 |
| 5.4.1 Adaptation to Contextual Correlates | 第71-74页 |
| 5.4.2 Salience of Adaptability Process | 第74-75页 |
| CHAPTER SIX CONCLUSION | 第75-79页 |
| 6.1 Findings | 第75-77页 |
| 6.2 Limitations | 第77-78页 |
| 6.3 Suggestions for Future Study | 第78-79页 |
| REFERENCES | 第79-81页 |
