O字開(kāi)頭的單詞或詞組
obscurityoverdraftornateoscillateorthopedicson leaveoverhearon holidayophthalmologyown tooverrateorienteeringoverstateorganizationaloxidativeon one's toesopen seaoversightointmentoverageorificeovershadowonerousoatmealout of characteroff-keyout-of-pocketombudsmanoil pump purifieroctaneomnivoreoutbackon the matolfactoryon the houseocelotolefinobjectionableoutcryovertakenon the way toonshore
