1. radical=extremly
2. ramification=consequence(ramification:分叉，分支，结果(consequence))
3. rare=scarce
4. rather than=instead of
5. reacting=responding.n反映
6. reactions=responses
7. readily=freely
8. realm=region
9. record
10. recover=retrieve
11. recreational=as a hobby
12. recurred=reappearedv再出现，重现
13. redundancy名 过多;重复;多馀物
14. refine=improve,
15. refined=perfected.adj精致的，完美的，精确的
16. reflect=mirror
17. refreshing=unusual(refreshing:提神的,新鲜宜人的，与众不同的)
18. regard for=attention to
19. region=vicinity(附近的)
20. regulate=control<重要>动 使有规则;取缔;调节
21. reinforced=strengthenedv加强，巩固
22. rejects=rufuses
23. relatively=comparatively
24. relevant=applicable可应用的，可适用的
25. reliably=dependably
26. remain=keep
27. remarkable=exceptional
28. remarkable=incredible(adj.不平常的, 非凡的, 值得注意的, 显著的) Extraordinarily
29. remedy=cure
30. remote=far away
31. renew=revive(复兴)
32. renewable=replacealbe
33. renown=prominence
34. repel=ward off.v抵制，避开，挡住
35. replacement=substitue代替品
36. reproduce=copy.v复制
37. reputedly=actually(号称地，一般认为地，据说地);
38. reputedly=supposedly, (supposedly, actually, easily and practically,我选supposedly, 不知对不对?)
39. requisite=required
40. reserve=save
41. restrain?
42. result=consequence
43. resume=begin again
44. reveal=show
45. reveals=discloses揭露透露
46. reverberate=reverberated... revibrate...
47. revibrate
48. revitalize=restore
49. revolution=dramatical change
50. revolutional=change