Merges are a key aspect of a source code control system in general and are especially common in a branch-oriented VCS.
合并一般是源代码控制系统中的关键方面，在面向分支的VCS尤其常见。
The paper tries to construct a 3D system model embodying the common laws of system on the basis of Bertalanffy's general theory of system.
本文在贝塔朗菲一般系统论的基础上构建了一个能够体现系统共同规律的3D系统模型。
CAD system for retaining wall is developed through analysis and research on calculation theory, common drawing process and general cross section of retaining wall.
通过对挡土墙计算理论、绘图的一般过程及常用断面形式的分析研究，开发了挡土墙CAD系统。
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