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  1. intruder alarm

    • n.
      an electronic device that emits a loud noise when someone attempts to gain unauthorized entry to a building or other premises
    • noun: intruder alarm, plural noun: intruder alarms

    • 釋義
    • n.
      名詞
    • 1. an electronic device that emits a loud noise when someone attempts to gain unauthorized entry to a building or other premises:

      staff arrived to find an intruder alarm had been activated

  2. 知識+