O字开头的单词或词组
or elseoppositionodorold-fashionedownershipoakon showorganonboardoson handoptimismordersorganismongoingoasisovercastoctaveout of dateover timeorbiton the walloathoptionalorientationobstinateobtainingoverlookokayoverlapobesityon boardonloadone-pieceouterold and youngoutletovertakeobservationoverseeoutrageousOscar
