O字开头的单词或词组
overthrowoperableout of controloxideonwardsonusover-official languageobstruentoverworkon toposteo-on paperopalottoospreyoppressionoverjoyon one's way homeOregononce a weekopen-airoverstressoutside ofoptimizingof the timeoriginal characterobedienceon endopen one's eyes toocto-out of habitOceanusobviateone-upobserveron the moveoverdraftoverdueoutboundon leaveoverpower
