形容词：
1. important—crucial, critical, significant, essential, vital
2. common—universal, ubiquitous
3. difficult—formidable, demanding
4. intermittent—periodical，at intervals
5. reckless—impertinent, pertinent, imprudent, careless
6. small—minor, insignificant, marginal, trivial;
7.famous—well-known, noted, renowned, nation-wide/worldwide reputation
be widely acknowledged/known
8. poor—needy ,impoverished, poverty-stricken
9: positive—favorable, rosy, promising, pleasurable
10: negative—unfavorable, adverse
11. beneficial—rewarding, helpful
12. inevitable—unavoidable
13. attractive—appeals to, exerts a tremendous fascination on sb
14. sensible—reasonable, rational, make sense
15. respective—each, separate
16. sufficient—enough，adequate
17. striking—obvious，distinct，prominent ; remarkable
18. intricate=complex, complicated, sophisticated,
19. an integral part of = indispensable, essential, critical
动词：
1. understand—discern, get to know
2. begin—commence, start
3. have—be equipped with, possess
4. know—be aware of, get acquainted with, be familiar with
5. show—demonstrate, manifest, reveal, suggest, indicate, reveal, imply
6. need—demand, require
7. cause—give rise to, lead to, result in, trigger
8. remember—bear in mind that
9. intensify—aggravate，worsen
10. sustain—maintain，keep
11. suffer—undergo, go through, subject to
12. protect—shelter, shield
13. intimidate—frighten, startle, terrify, scare,
14. restore—recover，regain
副词：
1. very—exceedingly, extremely, intensely, remarkably, noticeably
2. undoubtedly—with no doubt, without any doubt, out of question
3. often—frequently, from time to time
4. simultaneously=at the same time, concurrently, synchronously ; meanwhile
5. quickly—rapidly,promptly, instantly
6. sharply—drastically, dramatically
其他词性：
1. thing—affair ,business ,matter
2. before—prior to
3. if—in the event of, in case(of) ,on the condition that, suppose
4. now—at present, at this moment, currently , for the time being
5.about—regarding, concerning, involving relating to, with respect to,
with reference to
6. people—characters, folks, persons, masses
7. many—an army of, an ocean of, a sea of, a multitude of ,a host of,
8. aspect—facet, demension, sphere, in terms of
9. stereotype=cliché, outdated idea
词组：
1. more and more+adj. — increasingly, gets growing+n.
more and more+n.=a growing number of , an increasing number of
Eg. sth. gets more and more popular=sth has gained growing popularity.
sth is increasingly popular
2. in the end—eventually, finally, ultimately
3. get many benefits— reap huge fruits
4. for my part—from my own perspective, in my opinion
5. little if anything— little or nothing, hardly any
6. reasons for sth—account for, contribute to, owe to, thanks to, because of, due to…
7. pay attention to—focus on, fix one’s eyes on
8. disagree with sth. — frown on sth, be against sth., object to sth.
9. for example —to name only a few, take…as an example, for instance
10. harbor the idea that—take the attitude that, hold the view that;
11. too many/much—excessive, a disproportionate number of
12. all the time—continually, continuously, constantly, perpetually
13. as a result—consequently, subsequently
14. may not—is not likely, not necessarily