derailer

例句：

1. 1. The train's derailer was damaged in the accident.
   火车的脱轨器在事故中受损。
2. 2.They used a derailer to move the heavy equipment.
   他们使用脱轨器来移动重型设备。
3. 3. The derailer was designed to prevent accidents like this from happening again.
   脱轨器的设计是为了防止此类事故再次发生。