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  1. back number

    • IPA[ˈˌbak ˈnəmbər]

    美式

    • n.
      an issue of a periodical earlier than the current one.;a person or thing seen as old-fashioned.
    • noun: back number, plural noun: back numbers

    • 更多解釋

    英式

    • n.
      an issue of a periodical earlier than the current one.

    Oxford Dictionary