non-U：不为上层阶级所接受的

non-,无，非，U,缩写自upper class,上层阶级。

• operatic
• operation
• operational
• operative
• operatize
• operator
• operetta
• operose
• ophidophobia
• ophthalmic
• ophthalmo-
• ophthalmologist
• ophthalmology
• opiate
• opine
• opinion
• opinionated
• opinionist
• opium
• opossum
• opponent
• opportune
• opportunism
• opportunist
• opportunity