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  1. Oxford Dictionary

    unless

    • IPA[ʌnˈlɛs]

    英式

    • conj.
      except if (used to introduce the case in which a statement being made is not true or valid)
    • 釋義

    連接詞

    • 1. except if (used to introduce the case in which a statement being made is not true or valid) unless you have a photographic memory, repetition is vital manuscripts cannot be returned unless accompanied by a self-addressed envelope