route indicator circuit

例句：

1. 1.The new route indicator circuit has greatly improved the efficiency of our transportation system.
   新的路线指示电路大大提高了我们交通系统的效率。
2. 2.The engineer used a route indicator circuit to guide the construction workers through the complex tunnel.
   工程师使用路线指示电路来指导施工工人穿过复杂的隧道。
3. 3. The new route indicator circuit is expected to be installed in all major cities within the next year.
   预计新路线指示电路将在明年在所有主要城市安装。