O字開頭的單詞或詞組
occupanton lineoryxoutlayomnibusovationoverkillon requestoxi-odd joborange juiceon the part ofofftakeoffbeatornateon account ofout-of-dateOPECO. L.oxidationoverruleoverweighoff-loadoptical driveoriginatingon wingsout withoxy-orthopneaorthodonticodd numberoff limitson the rockson one's own accountOne man's meat is another man's poisonoversoulointmentone and allOrmosiaone dayozoneolfactory bulb
