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；
By statistically analysing those accidents of gas trunk line at Sichuan OaS Field, the paper concludes that the internal corrosion is the main reason in pipeline accidents.
本文通过对四川气田输气干线事故的统计分析，说明了内腐蚀是管道事故发生的主要原因。
Main conveyance passage and the carrying capacity of the trunk line will significant growth, goods exchanges between the city country will more multifarious.
主要运输通道和干线的运量将会大幅度增长，城乡之间的客货交流将更加频繁。
The highway is open to traffic the mileage and wills have the significant increment, the grade has the exaltation, will set up at a high speed the highway is the main National Freeway trunk line net .
公路通车里程将有大幅度的增加，等级有所提高，将建成以高速公路为主的国道干线网。
The highway is open to traffic the mileage and wills have the significant increment, the grade has the exaltation, will set up at a high speed the highway is the main National Freeway trunk line net .
公路通车里程将有大幅度的增加，等级有所提高，将建成以高速公路为主的国道干线网。
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