-
The blue line represents the trunk.
蓝色的线表示主干。
youdao
-
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。
youdao
-
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。
youdao