China is also adding copious amounts of traditional track and upgrading lines, mostly intended for freight.

中国也正在增加大量的传统线路以及升级已有线路，大部分是针对于货运线路。

youdao

China is also adding copious amounts of traditional track and upgrading lines, mostly intended for freight.

中国也正在增加大量的传统线路以及升级已有线路，大部分是针对于货运线路。

youdao