O字开头的单词或词组
observatoryopportuneolive oilon account ofoutliveoutreachoverrunOkieoccupationaloffice workerobservingonomatopoeiaon creditorchardobtuseohobbligatoon arrivaloutfloworthopedicoligo-otherwiseowe sth to sbon saleon the trackorder numberon the horizonoil filteroff and onoscilloscopeoperationaloutskirtsonce and for alloff guardold schooloverdoseoverplayover the yearsoveruseOedipus complexoutrighton schedule
