O字开头的单词或词组
overwhelminglyone-wayoverheadout of serviceone and onlyodouroverflowingoverplayOPopticonce and for allordinateon the surfaceolive oilomissionoutdateoutreachon one's way homeobtuseon fireon creditoverhangoutsetoff the shelfover driveoutrightOsakaoutdoon condition thatotherwiseOlympic Gamesopen one's eyes toobstruentoutskirtsone wayorder numberoliveoscilloscopeobnoxiousobstructionon paperoutsourcing
