track line

例句：

1. 1. The train tracks are visible from the station.
   从车站可以看到火车轨道。
2. 2.The path of least resistance is often the best choice.
   阻力最小的路径通常是最佳选择。
3. 3.The course of history is written in the sands of time.
   历史的进程在时间的沙粒中书写。