O字開(kāi)頭的單詞或詞組
OPD.on the airO2outstretchouterwearoversimplifyother oneon the runout of boundsOrientalismoff-dayorthodonticsosmosisopt foroperation manualorbitaloriginationoddballout of pocketoutshineoff-lineoff-dutyoverridingovertookoral examinationonce or twiceof noteoveremphasizeovertoneoccidentold stockoperation managerorthographicodorlessone-eyedon the alertonenessoutsizeoversawoverblownopening balanceopenly
