短語詞組短語enamelled semaphore arm 搪瓷臂板supplementary semaphore arm 臂板信號機(jī)的輔助臂板arm semaphore 號志臂木double -arm semaphore 雙臂板信號機(jī)upper quadrant single -arm semaphore signal 上曏單臂板信號機(jī) 返回 semaphore arm