track circuit wire

例句：

1. 1. The track circuit wire is essential for the operation of the train control system.
   跟踪电路线对于火车控制系统的运行至关重要。
2. 2.The engineer carefully checked the track circuit wire to ensure its integrity.
   工程师仔细检查了跟踪电路线，确保其完整性。
3. 3.The track circuit wire was used to detect the presence of obstacles in the tunnel.
   跟踪电路线被用来探测隧道中障碍物的存在。