C1 If something is obligatory, you must do it because of a rule or law, etc.(根据规定、法律等)必须履行的,强制性的,有义务的
The medical examination before you start work is obligatory.工作前必须先体检。
[ + to infinitive ] The statute made it obligatory for all healthy males between 14 and 60 to work.这条法令规定所有年龄在14至60岁的男子必须工作。 C2 expected because it usually happens(因为常发生而)必然的,预料之中的;惯常的
Several Secret Service agents surrounded the President, all wearing the obligatory raincoat and hat.几名特工围在总统四周,当然是一律穿着风雨衣,戴着帽子。