在这个场景中，区域服务器遍布于一个广泛的地理区域，每一个区域服务都有自己的WAN特性。
In this scenario, regional servers are spread across a wide geographical area, each one with its own WAN peculiarities.
为该区域的服务器程序定义程序定义。
Define program Definition for this server program in the Region.
该方法把请求划分给特定的负载均衡服务器，并处理来自请求者所在区域内服务器的请求及其他。
This method partitions the request to specific servers for load balancing, to serve a request from a server in the requestor's local region, and so on.
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