O字开头的单词或词组
oil spilloversimplifyoverridingoverdrawoutshineoutpouringout of stepoff the cuffouterwearoutburstoff-lineoratoryon one's own accountovertookooforthodonticsoriginationOSFother oneopenlyof noteozone layerout of pocketOrientalismout of boundsoptimaordinarilyoddballopt foroff-dutyonce or twiceobsequiousOlympiaowner's capitalon...basisonenessO2overtoneold stockoutlanderoperation manualoaths
