O字开头的单词或词组
of purposeoriginal copyovercrowdovertoneobject-orientedoodlesoathsout of syncowletoropharynxopen-endouter spaceomniscientout of questionoratoryoccludeouterwearone-timeoutspeakobstructingOv.overfilloff the rackO. D.oastonce too oftenopiateopenlyon the beatof noteoutmodedopen interestout of tuneoftentimesopinionatedoverstayoverridingonenessofferoroseodd jobson the fire
