pole changer operated by semaphore

例句：

1. 1.The car's pole changer is easy to use and convenient for daily driving.
   这款车的杆式变速器使用起来简单方便，适合日常驾驶。
2. 2. The new model of the car has a more efficient pole changer system.
   这款新车的杆式变速系统更加高效。
3. 3. The engineer tested the pole changer before installing it in the car.
   工程师在安装之前测试了杆式变速器。