1. important=crucial,critical significant essential vital
2. common=universal, ubiquitous(if something is ubiquitous, it seems to be everywhere)
4. difficult=formidable
5. understand=discern
6. all the time--continually, continuously, constantly, perpetually
7. as a result—consequently、
8. before--prior to
9. begin—commence
10. better—superior
11. big--major, significant, substantial
12. have--be equipped with, possess
13. if--in the event of, in case(of)
14. in the end--eventually, finally, ultimately
15. know--be aware of, be conversant with, familiar with
16. less and less--decreasing(ly)
17. more and more –increasingly
18. money--funding, funds, resources
19. more and more—increasingly
20. need--demand, require
21. now--at present, at this juncture, at this moment, currently
22. often--frequent(ly)
23. quick(ly)--rapid(ly),prompt(ly)
24. right--appropriate, correct, proper reasonable
25. sharp--abrupt, drastic dramatic
26. show--demonstrate, manifest reveal
27. small--minor/insignificant (problems, differences etc),marginal(不重要的，微小的)
28. too many--an excessive number of, a disproportionate number of
29. too much--excessive(ly)
30. about : regarding concerning involving relating to, with respect to, with reference to
31. Famous: well-known famed, noted, renowned, enjoy a nation-wide/worldwide reputation/fame be widely acknowledged/known
32. poor = needy = impoverished = poverty-stricken
