normally open track circuit

例句：

1. 1. The engineerswere able to quickly diagnose the problem and fix it with a normally open track circuit.
   工程师们能够迅速诊断出问题并使用一个通常开放的轨道电路来修复它。
2. 2.In this particular case, the normally open track circuit was responsible for the faulty operation of the machine.
   在这个特定的情况下，通常开放的轨道电路是导致机器故障操作的原因。
3. 3.The electrical engineers had to replace the normally open track circuit in order to ensure safe operation of the power supply system.
   电气工程师们不得不更换通常开放的轨道电路，以确保电力供应系统的安全运行。