main trunk

基本解释

When one developer changes files on a branch, those changes do not appear on the main trunk or on other branches.
当一个开发人员更改某个分支上的文件时，这种更改不会出现在主干或其它分支上。
Later, moving changes from one branch to another branch (or the main trunk) is performed by the merging operation.
稍后，由合并操作将更改从一个分支迁移到另一个分支（或主干）。
Ukraine is a weak link in Gazprom's transport network as the main trunk lines to Central Europe cross the former Soviet republic.
乌克兰是Gazprom的运输网络中的薄弱一环，因为管网的主干线都是穿过乌克兰而通向中欧的。

主干道
As the important node of the main trunk of the traffic, modern large bridge has the great significance to the transportation.
现代化大型桥梁作为交通主干道的重要节点，对交通运输具有重大意义。