fire alarm horn

短语

词形变化

fire alarm horns 复数 fire alarm horns

释义与例句

n.
  1. 1.

    A horn on a fire alarm that sounds in case of fire, either automatically when the system detects fire or manually when the alarm is pulled, to alert the occupants of a building or complex of the hazard.

  2. 2.

    A siren used to alert a town or neighborhood of fire.

    历史