betterment[改良/改进]/improvement
-eg: The betterment of the medical service is what the general public is looking for.;
compulsory education[义务教育]
-eg: 9-year compulsory education;
levy[征税/强加于]/impose
-eg: levy income tax/tax on real-estate.
以上就是新航道雅思频道为大家整理的雅思写作高频词汇介绍之改良，希望对大家有帮助，更多资讯、资料请访问新航道雅思写作频道 http://www.xhd.cn/ielts/xiezuo/
