that must be done because of a law or a rule synonym mandatory(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’.