mandatory
adjective formal uk/ˈmæn.də.tər.i/ us/ˈmæn.də.tɔːr.i/
强制的;必须履行的;法定的
Something that is mandatory must be done, or is demanded by law.
The minister is calling for mandatory prison sentences for people who assault police officers. 部长呼吁把袭警者须受的惩罚定为强制监禁。
Athletes must undergo a mandatory drugs test before competing in the championship. 运动员在锦标赛前必须进行强制性药检。
In 1991, the British government made it mandatory to wear rear seat belts in cars. 1991年，英国政府强制要求汽车后座乘客系安全带。
Synonyms: compulsoryobligatory