1. indeed 的确
2. surely 无疑,
3. however 然而,
4. obviously 显然,
5. frankly 坦率地说,
6. naturally 自然,
7. luckily (或happily)for sb. 算某人幸运,
8. fortunately / luckily 幸好,
9. honestly 真的,
10. briefly 简单地说,
11. strange to say 说也奇怪,
12. needless to say 不用说,
13. most important of all 最为重要是,
14. in a few words(或 in sum, in short)简而言之,
15. in other words 换句话说,
16. in a sense 在某种意义上,
17. in general 一般说来,
18. in my view 在我看来,
19. in conclusion 总之,
20. in summary 概括地说,
21. in fact 事实上,
22. in the first place 首先,
23. in addition 此外,
24. of course 当然,
25. to my knowledge 据我所知,
26. for instance (或example)例如,
27. as a matter of fact 事实上,
28. strictly speaking 严格地说,
29. generally speaking 一般地说,
30. judging from... 根据...判断
31. to be sure 无疑,
32. to sum up 概括地说,
33. to tell the truth 老实说,
34. I am sure 我可以肯定地说,
35. I believe 我相信,
36. I wonder 我不知道,
37. that is 也就是说
38. it seems 看来是,
39. as I see it 照我看来,
40. what is important (serious) 重要(严重)的是,
(来源:沪江英语)