O字开头的单词或词组
onomatopoeiaoverhauloneselfoversleepOrizaba jalapOOPoff and onobstructoverjoyedomeletone-offoverloadOkieovooverdooffice workerotterobbligatooolongopportuneoff-siteowoverleafowe sth to sboff guardoverreactoil filteroilsOceaniaorchidorchardon the horizonoverwhelminglyon the trackoverrunout of serviceone-wayoverestimateodourobservingon one's way homeolive oil
