O字开头的单词或词组
oppositelyonrushoscoomphon the jobobscenityopenlyoastout of useonenessoutpouringOTDon trialon the fenceOCoccludeouter spaceout of tuneobject-orientedovercrowdopinionatedOlympiaorthonormalobstructingoratoryoffice hoursoutmodedOne cannot make a silk purse out of a sow's earoutlanderoil painton grounds ofoverarchoathsoutpostoutspeakone-timeoverstayordinarilyonce moreoutrideoverfillon record
