railway crossing bar

例句：

1. 1.The railway crossing bar is a crucial part of the railway system.
   铁路交叉杆是铁路系统的关键部分。
2. 2. The engineer carefully checked the condition of the railway crossing bar before starting work.
   工程师在开始工作前仔细检查了铁路交叉杆的状况。
3. 3. The railway crossing bar was damaged during the recent storm, requiring immediate repair.
   最近暴风雨期间，铁路交叉杆受损，需要立即修复。