obligatory
UK [ə'blɪg.ə.tər.i] US [-tɔ:r-] adjective
■describes something you must do 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 fit males between 12 and 60 to work.这条法令规定所有年龄在12至60岁的男子必须工作。 ■expected because it usually happens （因为常发生而）必然的，预料之中的；惯常的•Some secret service agents turned up, all wearing the obligatory raincoat and hat.几名特工出现了，当然是一律穿着风雨衣，戴着帽子。 |