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
Trains must proceed cautiously through dark territory where signals are sparse and communication with dispatchers is limited.
列车必须在黑暗区域谨慎行驶，那里的信号稀少，与调度员的通信有限。
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。
