O字開(kāi)頭的單詞或詞組
off-trackorienteeringonshoreopineof a kindOsageoboeodourlessobserverophthalmologyO-levelobey the lawoperabilityobservanceorthogonaloff seasonogreoffice buildingoxidative phosphorylationout and aboutoutworkobfuscateoversleptousteroxi-on lineoutageoutbackopeneroccupantobsessive-compulsiveottooppressiveon the shelfout of characteroutcryodd joboringoutlayolivineofftakeodd number