“信号机”用英语怎么说？

“信号机”的拼音为：xìn hào jī...

信号机是红色时,火车必须停驶.The train must stop when the signal's red.本文还详细地介绍了一套智能交通信号机系统的整体设计.The paper also introduces detail a set of whole design Intelligent Traffic Signal System.随着科学技术的发展,信号机及其检测技术也在不断发展.The signal machin...