olfaction

n. 嗅觉

old lag, old maid, old man, old man's beard, old master, old school, old stager, old sweat, old woman, old-fashioned, old-maidish, old-time, old-timer, old-world, olden, oldie, oldish, oldster, oleaginous, oleander, olfactory, oligarch, oligarchy, olive, olive oil, olive-branch, Olympiad, Olympian, Olympic, Olympic Games, Olympics, OM, ombudsman, omega, omelet, omelette (also omelet), omen, ominous, ominously, omission,