Four things have changed as we progressed from the previous hub and spoke architecture to service exposition, three of which you can see by comparing the previous figures with figure 11.

从之前的中心辐射架构到现在的服务公开，发生了四个变化，通过对比之前的图和图11，我们可以看出其中的三个变化。

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The architecture is hub and spoke based, meaning there is a central coordinator which is managing the clients.

这个架构是中心辐射的，也就是有一个管理客户端的中心调度器。

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Let's recall the traditional hub and spoke integration architecture (Figure 1) of SIMM level 3.

让我们回忆一下SIMM级别3的传统拓扑集成架构(图1)。

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