semaphore signal

短语

臂板信号；手旗信号；横杆信号

词形变化

semaphore signals 复数 semaphore signals

释义与例句

n.
  1. 1.

    Any signal sent by semaphore.

  2. 2.

    A railway signal with a moving arm mounted on a signal post or gantry, the position of the arm indicating whether a train should stop or proceed; they are now largely replaced by colour light signals.

    交通