approach section track circuit

例句：

1. 1. Theengineer designed a new approach section to improvetraffic flow.
   工程师设计了一个新的接近部分来改善交通流量。
2. 2. The construction crew worked onthe track circuit during the night shift.
   施工队在夜班期间对轨道电路进行了工作。
3. 3. The train's signal system relieson a sophisticated track circuit for safety.
   火车的信号系统依赖于一个复杂的轨道电路以确保安全。