off the rails

例句：

1. 1. The car was off the rails when it hit the curb.
   汽车撞上路边时失去了控制。
2. 2. His behavior was off the rails after he got drunk.
   他喝醉后行为变得失控了。
3. 3. The train was off the rails and had to be stopped by a signalman.
   火车脱轨了，需要信号员来停止它。