| Abstract | 第4-5页 |
| 摘要 | 第6-10页 |
| Introduction | 第10-14页 |
| 1 Literature Review | 第14-24页 |
| 1.1 External variations in different disciplines | 第14-19页 |
| 1.2 Internal variations in research articles | 第19-22页 |
| 1.3 Internal variations in IMRD sections | 第22-24页 |
| 2 Methodology | 第24-31页 |
| 2.1 Corpora | 第24-29页 |
| 2.2 Procedures | 第29-31页 |
| 3.Results and Discussion | 第31-66页 |
| 3.1 Overall distribution of core lexical and grammatical categories | 第31-32页 |
| 3.2 Comparison of the distribution of eight semantic classes of nouns across registers | 第32-43页 |
| 3.3 Comparison of the distribution of four semantic classes of verbs across registers | 第43-48页 |
| 3.4 Comparison of the distribution of passive voices across registers | 第48-52页 |
| 3.5 Comparison of the distribution of verb tense across registers | 第52-56页 |
| 3.6 Comparison of the distribution of personal pronouns across registers | 第56-66页 |
| Conclusion | 第66-70页 |
| References | 第70-75页 |
| Acknowledgements | 第75-76页 |
| Appendix1 Semantic Classes of nouns and verbs | 第76-79页 |
