简言之，矢量数据利用最简单的拓扑实体—点、线和多边形，并在二维笛卡尔坐标系统中固定它们来描述地理特征。

In short, vector data take the simplest topological entities — points, lines, and polygons — and anchor them within a 2-d Cartesian coordinate system to describe geographical features.

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由于SIBus是通过拓扑定义的逻辑实体，所以它在许多安装并启动的Enterprise Applications中物理上地显示出来。

As the SIBus is a logical entity defined across the topology, it is physically manifested in a number of Enterprise Applications that are installed and started.

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在配置过程的这个阶段，您在实例中具备集群拓扑——ha或wlm集群——并且准备将其用于创建SIBus的逻辑实体。

At this point in the configuration, you have in your example a cluster topology — either ha or WLM cluster — and prepared it for the creation of the logical entities of the SIBus.

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