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  1. Oxford American Dictionary

    sine qua non

    • IPA[ˌsinā ˌkwä ˈnōn]

    美式

    • n.
      an essential condition; a thing that is absolutely necessary

    • noun: sine qua non, plural noun: sine qua nons

    • 釋義

    名詞

    • 1. an essential condition; a thing that is absolutely necessary grammar and usage are the sine qua non of language teaching and learning