用于管理资产的系统是分布开发的主干。
A system for managing assets serves as the backbone of distributed development.
团队进行并行开发时，一定要以最高的频率将代码合并回干线(即主干)。
When a team develops in parallel, it's important to merge code back to the mainline (trunk) as often as feasible.
主干：用于干线开发。
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