单词	burthen
释义	burthenbur‧then /ˈbɜːðən $ ˈbɜːr-/ noun [countable] literary a burden
随便看	operational operationally operational research Operation Desert Storm Operation Iraqi Freedom Operation Overlord operative operator operetta Ophelia ophthalmic ophthalmologist ophthalmology opiate opine opinion opinionated opinion-makers opinion poll opium opossum opp. Oppenheimer, J. Robert opponent opportune

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