可以将多个服务台组合起来以协作方式工作；当出现这种情况时，将聚集的服务台称为服务中心（service hub）。因此，服务域拥有了由异构的自主服务处理单元组成的嵌套式体系结构，这些处理单元本身是服务台或服务中心。
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The race is on to be a global service hub.
一场向着全球服务枢纽迈进的比赛已经拉开帷幕。
Rwanda now needs a vigorous private sector to keep the economy moving in the right direction, especially if the country is to meet its lofty goal of becoming east Africa's service hub.
卢旺达现在需要一个有活力的私营部分来保证经济朝着正确的方向前进，尤其是如果这个国家想要达到成为东部非洲的服务中心这一高远目标。
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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