O字开头的单词或词组
observationon showouteroutdooroctaveovertakeorderedopen-endedoutrageousoftoutletoffensiveoffshoreoxenofficeon the weekendoccurrenceobedientoverdriveoinkoilyon the lineourselvesout of placeoppressone-shotonloadoutplayobverseoraoverseeOEDobliqueounceOvidopacityOrionoilout of workon footout of sighton top of
