单词	two-up, two-down
释义	two-up, two-downˌtwo-ˈup, ˌtwo-ˈdown noun [countable] British English a small house with two rooms upstairs and two rooms downstairs
随便看	operator operetta Ophelia ophthalmic ophthalmologist ophthalmology opiate opine opinion opinionated opinion-makers opinion poll opium opossum opp. Oppenheimer, J. Robert opponent opportune opportunely opportunism opportunist opportunistic opportunity oppose opposed

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