raison d'etre[reizɔ:nˈdeltr]

（法语）n .存在的理由

• ophuls，max
• opie，john
• opinion
• opinioned
• opitz，martin
• opium
• opium poppy
• opole
• oporto(或porto)
• opossum
• oppenheimer
• oppenheimer，j.robert
• opponent
• opportune
• oppose
• opposed
• opposeless
• opposite
• opposition
• oppress
• oppressed
• oppression
• opprobriously
• o-proposition
• opry-house