distance between bogie pivot centers

例句：

1. 1.The distance between the two cities is 50 kilometers.
   两座城市之间的距离是50公里。
2. 2.The distance between the two countries is about 3000 kilometers.
   两国之间的距离大约是3000公里。
3. 3.The distance between the two points is 10 meters.
   两点之间的距离是10米。