nationing main trunk line 国道骨支线
Singapore-Lasa main trunk line 新加坡
main trunk of hydraulic line 输水线路总干
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。
These gathering systems are normally owned by the pipeline company that operates the main trunk line.
集油管道系统和原油干线管道常归管道公司所有。
Then divides the highway network into four levels: main trunk line, sub-trunk, feeder and connecting line, and also positions functions of the four levels.
进而按照通达程度将公路网划分为四个等级：主干线、次主干线、支线和连接线，并分别对四个层级进行了功能定位；
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