track obstruction indicator

例句：

1. 1. The track obstruction indicator is used to indicate the location of obstacles on the track.
   轨道障碍物跟踪指示器用于指示轨道上的障碍物位置。
2. 2.The train's track obstruction indicator is activated when it encounters an obstacle.
   当火车遇到障碍物时，会激活轨道障碍物跟踪指示器。
3. 3.The track obstruction indicator helps to prevent accidents by alerting the driver to potential obstacles ahead.
   轨道障碍物跟踪指示器通过提醒司机前方可能存在的障碍物，帮助预防事故。