1.improve提高：promote、advance、enhance
2.change改变：transform
3.emphasize强调：highlight、stress、address
4.develop培养：agriculture、cultivate、nurture
5.break破坏：impair、undermine、jeopardize、devastate
6.keep保存：preserve、conserve
7.deal with解决：tackle、address、resolve
8.need需要：require、necessitate、callfor
9.forefather祖先：ancestor、predecessor
10.difference不同：gap、distinction
11.crime犯罪：delinquency、criminalact
12.environment环境：circumstance、atmosphere、surrounding、ambience
13.pollution污染：contamination
14.human人类：thehumanrace、humanity、humankind
15.danger危险：peril、hazard
16.inmodernsociety在当今社会：incontemporarysociety、inpresent-daysociety、inthisdayandage
17.everywhere普遍的：widespread、prevalent、overflow、rampant
18.good好的：beneficial、advantageous
19.harmful有害的：inhumane、detrimental、baneful
20.rich富有的：wealthy、affluent
21.poor贫穷的：impoverished
22.serious严重的：severe
23.obvious明显的：manifest、apparent、evident
24.cheap便宜的：economical、inexpensive