obligate

v.(在法律或道义上)强制...做某事

obesity, obey, obfuscate, obfuscation, obiter dictum, obituary, object, object glass, object lens, object lesson, object to, object to sth., objection, objectionable, objectionably, objective, objectively, objectivity, objector, objet d'art, oblate, obligation, obligatory, oblige, obliged, obliging, obligingly, oblique, oblique angle, obliquely, obliqueness, obliquity, obliterate, obliteration, oblivion, oblivious, obliviousness, oblong, obloquy, obnoxious, obnoxiously,