/kəmˈpʌl.sɚ.i/
that must be done because of a law or a rule
It is compulsory for all motorcyclists to wear helmets.
所有骑摩托车的人都必须戴头盔，这是强制性的。
English is a compulsory subject at this level.
英语在这一级别是必修科目。
compulsory education/schooling
义务教育
compulsory redundancies
强制裁员