O字開(kāi)頭的單詞或詞組
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
