O字开头的单词或词组
on handobstinateouterorderedor sooutrageousovercastopen-endedOrionofficeorganoccurrenceonionon dutyone-shotoctaveoutletor elseon showoffensiveout of orderoiloftobedientoraon footoinkoffshoreoppressoverdriveounceoverturnon top ofopuson the weekendofferingout of breathobservantoverseeoutplayout of placeornament
