compulsory a.义务的；必修的；被强制的
【真题再现】Many countries have adopted systems of compulsory education in order to promote the average level of education.
许多国家为了提高平均教育水平而采用义务教育体制。
【CET-6,2003.06,词汇】
【联想记单词】词根词缀：com+ps(驱动，推)+ory(a.)→不断推的→强制性的
【活学活用】-It is compulsory to wear helmets!
-戴头盔真是被强迫的！