O字母开头的单词或词组(第12页)：
- oath
- obdurate
- obedient
- obeisance
- obese
- obfuscate
- obituary
- objection
- objective
- obligation
- obligatory
- oblige
- obliging
- oblique
- obliterate
- oblivious
- obnoxious
- obloquy
- obscure
- obscurity
- obsequious
- obsess
- obsessed
- observatory
- obsession
- obsolescent
- obsolete
- obstacle
- obstinacy
- obstinate
- obstreperous
- obtainable
- obtuse
- obverse
- obstruct
- obstruction
- Odyssey
- obviate
- obvious
- occlude
- occurrence
- occupation
- octogenarian
- odds