Dark territory
01
黑暗地带, 没有先进信号系统的区域
the sections of tracks without advanced signaling systems, relying instead on manual or basic signaling for train operation and safety
例子
The railroad company invested in upgrading the signaling equipment to reduce the amount of dark territory along the main line.
铁路公司投资升级信号设备,以减少主线沿线的黑暗区域。



























