rail support

例句：

1. 1.The train needs rail support to keep its wheels in place.
   火车需要轨道支撑来保持轮子的位置。
2. 2. The engineer carefully checked the rail support before starting the work.
   工程师在开始工作前仔细检查了轨道支撑。
3. 3.The railway was damaged during a recent storm, and rail support was urgently needed to repair it.
   最近一场暴风雨损坏了铁路，迫切需要轨道支撑进行修复。