O字开头的单词或词组
oncogeneoxi-OsirisoversoulopiateOCRorthodonticoscillationOne man's meat is another man's poisonon-timeoddnesson the decreaseon consignmentomniscientold-timeorallyopen onobservableobliterateon the flyoptical driveoil spillon one's own accountoakumover weightOrmosiaoutpatientoctagonoliooverdrawoil pumporiginatororder formoff the cuffoutburstout of steponce for allon...basisowner's capitalouterwearoofoversimplify
