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  1. Oxford Dictionary

    helicopter patrol

    • n.
      a group of military or police helicopters that keep watch over an area by regularly flying over it

    • noun: helicopter patrol, plural noun: helicopter patrols

    • 釋義

    名詞

    • 1. a group of military or police helicopters that keep watch over an area by regularly flying over it there is a helicopter patrol and all police vehicles are on the alert