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  1. air letter

    英式

    • n.
      a sheet of light paper folded and sealed to form a letter for sending by airmail.
    • noun: air letter, plural noun: air letters

    • 更多解釋
    • IPA[ˈe(ə)r ˌledər]

    美式

    • n.
      another term for aerogramme

    Oxford American Dictionary