单词

ownership oxide owe overtake overwrought overwhelm overture oversee overthrow overrun overt override overlook overdue overhear overhaul overall overlap overflow ovation oval outweigh outstrip outspoken outskirts outset outright outrageous output outlying outlet outlaw outline outfit outdo outdated outcry outcome outcast outbreak out of stock oust ostentation ostensible out of line with oscillate orthodox ornament originate original origin orientate orientate oneself oriental organism organ ore orderly ordeal orchestra orchard orbit optional option optimum optimism optical opt opposite oppose opportunity opponent opinion opening opaque onset onlooker ongoing one another one oncoming once more once in a while once on time on no account on the air on hand on edge on good terms with sb. on end on condition that on board on behalf of on and on on and off omit ominous omen offspring offshore off-hand offset offend offence offer on account to odour odds and ends odds odd occurrence occur occupy occasion obvious obstruct obstinate obsess obsolete obsession Odyssey observe observatory observance obscure obscene obnoxious oblong obliging oblige obligatory oblivious oblique obligation objective objection object obedient oath oasis oar