trunk line

汉语翻译

干线, 中继线
【计】 中继线路

英语解释

名词 trunk line:

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

例句

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。