It is for applications that have the ability to connect to the cluster and host ancillary services and end user applications which directly access the cluster.
它是为能够连接到簇集中的应用程序所用的，并且会部署辅助服务以及能够直接访问簇集的最终用户应用程序。
Ensure the cluster of servers appears as a single server to the end user.
确保在最终用户端可以把这组服务器视为一个单独的服务器。
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