O字开头的单词或词组
organismoverseasoysteroutsiderorienton boardoriginalityoathone-pieceon the sceneold-fashionedover and over againostrichout of dateongoingold and youngon occasionoptimismoasisoakobtainingover timeon the sideonce in a whileOscarodoron one's ownother thanoverlapoverviewoptionalOsakaon the wallon handoverlookoutdoororientationor soordersobstinateobservationordered
