com·pul·so·ry
adjective/kəmˈpʌlsəri/
/kəmˈpʌlsəri/
- that must be done because of a law or a rule
（因法律或规则而）必须做的，强制的，强迫的 - 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 - The strikers are protesting against the threat of compulsory redundancies.
罢工者抗议强制裁员的威胁。 - There is no compulsory education in this part of Africa.
非洲这一地区没有义务教育。 - it is compulsory (for somebody/something) to do something 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。
Oxford Collocations DictionaryCompulsory is used with these nouns:- attendance
- conscription
- education
- …
Word Originearly 16th cent. (as a noun denoting a legal mandate which had to be obeyed): from medieval Latin compulsorius, from compuls- ‘driven, forced’, from the verb compellere, from com- ‘together’ + pellere ‘drive’. - English is a compulsory subject at this level.