obligatoryKK [əˈblɪgəˌtɔri] ｜ /əˈblɪgəˌtɔri/
GEPT 中高級
C1adjective
required by obligation, compulsion, or convention
Attending the board meeting is obligatory for all executives.
強制性的；必須的
C1adjective
binding or morally and legally constraining
Wearing a seatbelt is obligatory while driving a car.
有約束力的；義務性的
C2adjective
mandated or dictated by a designated authority or decision-making body
Wearing a seatbelt is obligatory in many countries to ensure passenger safety.