broken rail base

例句：

1. 1. The train was derailed dueto a sudden change in weather conditions.
   由于天气条件突然变化，火车脱轨了。
2. 2.The engineer inspected the broken rail basefor any signs of damage.
   工程师检查了断裂的铁轨基础，以寻找任何损坏的迹象。
3. 3. The constructioncrew had to repair thebroken rail base before they couldcontinue work on the bridge.
   施工队在修复断裂的铁轨基础之前，无法继续在桥上工作。