O字开头的单词或词组
outsiderorientortoptownershipon boardoverseasostrichoathold-fashionedoriginalityout of dateone-pieceold and youngoakongoingon the sceneoptimismoasisover and over againOscarodoron occasionorientationoverlapobtainingoverlookover timeoutdoorovertakeonce in a whileOsakaon the sideon one's ownourselvesordersoxenother thanobservationoverviewoptionalon the wall
