“干线的”的英语可以翻译为：trunk，arterial ...

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...