“干线的”用英语怎么说？

这就是伦敦西部三条主要交通干线的交汇处.This is the place where the three main arteries of West London traffic met.失事车辆阻碍了那条铁路干线的交通.The wreck help up traffic on the railroads main line tracks.光纤已是长途干线的首选传输媒质.Optic fiber is now the preferred...