O字开头的单词或词组
outsiderout of itoptortownershipon boardoathoverseasostrichold-fashionedoriginalityongoingold and youngout of dateone-pieceon the sceneoptimismoakoasisoutdoorover and over againOscaroverlapodororientationon occasionoverlookourselvesobtainingovertakeover timeon the sideonce in a whileOsakaon one's ownoxenordersobservationother thanouteron the walloptional
