obscure

a.暗的；不清楚的

oblique angle, obliquely, obliqueness, obliquity, obliterate, obliteration, oblivion, oblivious, obliviousness, oblong, obloquy, obnoxious, obnoxiously, obnoxiousness, oboe, oboist, obscene, obscenely, obscenity, obscur, obscurely, obscurity, obsequies, obsequious, obsequiously, obsequiousness, observable, observance, observant, observantly, observation, observation car, observation post, observatory, observe, observer, observing, obsess, obsessed, obsession,