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  1. patent log

    • IPA[ˈpatnt lôɡ]
    • n.
      a mechanical device used to measure the speed and distance traveled through the water of a ship or boat.
    • noun: patent log, plural noun: patent logs

    • 更多解釋
    • n.
      a mechanical device towed in the water behind a boat to measure its speed and distance travelled.

    Oxford Dictionary