rail wing

例句：

1. 2.
   火车、汽车等的
2. 1. The train's wheels are set in the rails.
   火车的轮子安装在轨道上。
3. 2. The new bridge is built on a steel rail.
   新桥建在钢轨上。
4. 3. The train was pulled back onto the rails by the engineer.
   工程师把火车拉回到轨道上。