O字开头的单词或词组
orderlyor sooverweightOsloobliqueOhioohmoatsoptimistopticalosmanthusoverwatchokraoysterosteoporosison the wholeoperatororaowingon the tableoriginal designoutlookOscarofficeofferingon footoxymoronoutwardoncologyoreon the leftoutrunover and overover allopposingon top ofoverturnobservantone-shotorganisedobjectivelyoblivion