trunk line

漢語翻譯

英文解釋：

名詞 trunk line:

1. line that is the main route on a railway
   同義詞：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.
   同任何公路系統一樣，聯邦航空線路也有其主航線。