train kilometers

例句：

1. 1. The train journey took us through many beautiful landscapes.
   这次火车旅行让我们经过了许多美丽的风景。
2. 2. The train company has announced plans to increase the number of trains in the area.
   这家火车公司宣布计划增加该地区的火车班次。
3. 3. To calculate the total distance traveled, we need to add up all the train kilometers.
   为了计算总行程距离，我们需要将所有火车里程加起来。