DC track circuit

例句：

1. 1.The DC track circuit was designed to detect any electrical interference.
   直流轨道电路被设计来检测任何电干扰。
2. 2. The engineers used the DC track circuit to monitor the power grid.
   工程师们使用直流轨道电路来监控电网。
3. 3. The DC track circuit is crucial for maintaining safe and reliable communication between stations.
   直流轨道电路对于保持车站之间的安全和可靠通信至关重要。