current rail gap indicator sign

例句：

1. 1. The railway company has installed anew current rail gap indicator to improve safety.
   铁路公司安装了一个新的当前轨道间隙指示器，以提高安全性。
2. 2. The engineer used thecurrent rail gap indicator to check the alignmentof the tracks.
   工程师使用当前轨道间隙指示器检查轨道的对齐情况。
3. 3.The current rail gap indicator is crucial formaintaining the integrity of the railway system.
   当前轨道间隙指示器对于维护铁路系统的完整性至关重要。