O字开头的单词或词组
obsceneoverworkonce a weekoverthrowone wayout of controlOlympic GamesOregonornateoppressionover driveof lateonusoff the shelfOLEospreyopalosteo-ointmentoverrateofficial languageon paperobstruentoptimizingoverjoyottoobserveroutside ofoverpoweroatmealOCopen-airof the timeoverstressobedienceout of characterone-upon endoverhearOceanuson holidayolefin
