O字开头的单词或词组
obverseorderedor soopticalobedientOvidout of sightoptimaloftortOEDout of workout of placeon the lineoutdooroxenoffshoreoppressopen-endedon the weekendounceobliqueoinkon Mondayopacityoffensiveon one's own termsoutplayopen one's mind toourselvesoperatoroccurrenceoverdriveoozeout of the wayoffenseorganisationoxytocinorganizerobservantofficeopening
