track marking

例句：

1. 1. The engineer used a laser to mark the track for the new train.
   工程师用激光为新火车标出了轨道。
2. 2.The construction workers were required to follow the track markings while working on the road.
   施工人员在施工时必须遵守轨道标记。
3. 3. The railway company has been using high-tech track markings to improve safety and efficiency.
   铁路公司一直在使用高科技的轨道标记来提高安全性和效率。