首字母 a b c d e f g h i j k l m n o p q r s t u v w x y z

o开头的英语单词、第一个字母是o的英语词组有哪些（第3页）

oral orange orbit order orderly organ ordinary organization organize origin originate ornament other otherwise ought ounce our ours ourselves out outbreak outdoors outgrow outcome outlook outside output over overcoat outstanding overcome overhead overnight oversea overtake overtime overwork owe owing own owner ownership ox obey oxygen object observe obtain occasion occasional occupy occur ocean October odd of off oh offence offer office official officer oil operate often okay on old oneself only once one open opening opera opinion opportunity opposite opposition opt optical oak oasis oath obdurate obedient obeisance obese obfuscate obituary objection objective obligation obligatory oblige obliging oblique obliterate oblivious obnoxious obloquy obscure obscurity obsequious obsess obsessed observatory obsession obsolescent obsolete obstacle obstinacy obstinate obstreperous obtainable obtuse obverse obstruct obstruction Odyssey obviate obvious occlude occurrence occupation octogenarian odds occult ode odious odium odometer offence(offense) offbeat offend offensive offhand onset officious off-key offset offish offspring offstage ogle ointment oligarchy omelet olfaction ominous omnipresent omit omnipotent omniscient onerous opacity opalescence opaque operative operetta opine opinionated opponent opportune oppose oppress opprobrious optimism optimist optimum optional opulent oration oratorio oracle oratory orchard orchestra ordain ordeal ordinance ordnance ore originality organism orient original ornate ornithology orthodontics orthodox oscillate osmosis osseous ossify ostensible ostentation ostracism ostracize