main railway line

• 铁路干线

main railway line的用法和样例：

例句

1. The flood washed away part of the main railway lines.
   洪水冲走了部分铁路干线。
2. With their aid a vital viaduct on the main Athens railway line was destroyed.
   在他们的帮助下，破坏了雅典铁路干线上的一座主要高架桥梁。