Based on Image Theory and tube-tree method, an applicable ray tracing method based on virtual source tree was presented in this paper.

本文在参照了镜像法、射线管法等射线跟踪思想的基础上，提出了一种有效的基于虚拟源树的射线跟踪模型。

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This paper provides an effective ray tracing method for prediction of microcellular radio propagation, which is called a ray tracing method based on virtual source binary tree.

本文提出了一种能有效预测微小区环境中电波传播的射线跟踪算法——基于虚拟源二叉树的射线跟踪算法。

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But each resource - a file or folder - in this source tree can have complicated version graphs, based on the branches created for each resource. (so in this sense a VOB is like a virtual repository).

但是每一个资源，一个文件或是一个文件夹，在这棵资源树中都对应于很复杂的版本图，这些版本图是基于对每个资源所创建的分支。(这么看起来，VOB像一个虚拟库。)

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But each resource - a file or folder - in this source tree can have complicated version graphs, based on the branches created for each resource. (so in this sense a VOB is like a virtual repository).

但是每一个资源，一个文件或是一个文件夹，在这棵资源树中都对应于很复杂的版本图，这些版本图是基于对每个资源所创建的分支。(这么看起来，VOB像一个虚拟库。)

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