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  1. Oxford American Dictionary

    guide number

    • IPA[ɡīd ˈnəmbər]
    • n.
      a measure of the power of a flashgun expressed in meters or feet.

    • noun: guide number, plural noun: guide numbers

    • 更多解釋

    guide number

    • n.
      a measure of the power of a flashgun expressed in metres or feet.

    Oxford Dictionary