以下是新东方在线雅思网给大家分享的雅思写作高频词汇：改良。希望对大家的雅思备考有所帮助，更多雅思备考资料欢迎大家随时关注新东方在线雅思网。

　　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.