trunk line

汉语翻译

英语解释：

名词 trunk line:

1. line that is the main route on a railway
   同义词：trunk route
2. a telephone line connecting two exchanges directly

例句：

1. Like any highway system, the federal airways have their main trunk line.
   同任何公路系统一样，联邦航空线路也有其主航线。