track geometry measuring trolley

例句：

1. 1. The train tracks are laid out in a straight line.
   火车轨道是直线铺设的。
2. 2. The hiker followed the marked trail to the summit.
   徒步旅行者沿着标记的路径走到山顶。
3. 3.The detective used the tracks to trace the criminal's movements.
   侦探利用轨道追踪罪犯的行动。