call button

短语

词形变化

call buttons 复数 call buttons

释义与例句

n.
  1. 1.

    A button used to request some form of mechanical service.

    A button used to summon an elevator.

  2. 2.

    A button used to request assistance.

  3. 3.

    A button used to request some form of mechanical service.

    A button used to request a walk signal at a pedestrian crossing.