distance between centers of freight turning rack

例句：

1. 1. The distance between the two cities is about 500 kilometers.
   两座城市之间的距离大约是500公里。
2. 2.The distance between the Earth and the Moon is approximately 384,400 kilometers.
   地球和月球之间的距离大约是384,400公里。
3. 3. The distance between the two countries has been steadily increasing over the years.
   两国之间的距离多年来一直在稳步增加。