O字开头的单词或词组
on handobstinateouterorderedor sooutrageousovercastopen-endedofficeOrionorganoccurrenceonionon dutyout of orderone-shotoctaveoutletor elseon showoffensiveoiloftobedientoraon footoinkoffshoreoppressoverdriveounceoverturnon top ofofferingopuson the weekendout of breathoverseeobservantout of placeoutplayornament
