基本解释[机械工程]号志臂木词组短语短语enamelled semaphore arm 搪瓷臂板supplementary semaphore arm 臂板信号机的辅助臂板arm semaphore 号志臂木double -arm semaphore 双臂板信号机upper quadrant single -arm semaphore signal 上向单臂板信号机semaphore arm更多词组专业释义机械工程号志臂木