track gage

例句：

1. 1.The engineer used a track gage tomeasure the distance between the two points.
   工程师使用测距仪测量了两点之间的距离。
2. 2. Thedetective followed the trail of clues witha track gage.
   侦探用测距仪追踪线索。
3. 3. The scientist recorded data using atrack gage.
   科学家使用测距仪记录数据。