O字开头的单词或词组
old stockoffice hoursonanismon the declineon-timeon trialold-timeoriginationoutcastoverflewoliooppositelyoceanicout of useoomphobscenityopening balanceoverboardout of stepoff-dutyoil sealoutshineof purposeout of pocketodometeron grounds oforthodonticsoriginal copyOCon the fenceout of syncocarinaovercrowdoff-dayoutburstovertoneowletoodlesovertime workout of questionone-timeodorless
