| obstinate | adj.固執的 =unyielding=adamant=stubborn |
| omnipresent | adj.無所不在的 =ubiquitous=pervasive=unicersal |
| opaque | adj.不透明的,不清晰的 =vague=impenetrable=obscue |
| oratory | n.雄辯,演說 =elocution=eloquence=rhetoric |
| ornate | adj.裝飾很華麗的 =adorned=fancy=decorated |
| ornithology | n.鳥類學 |
| oscillate | v.動搖,搖擺不定 =fluctuate=vaciltate |
| outfit | n.全套服裝 =attire=dress=costume |
| outlaw | v.使非法,禁止=ban=forbid=prohibit n.罪犯,歹徒=villain |
| outrageous | adj.不道德的,惡毒的 =shameful=disgraceful=atrocious |