服务选择器模式对简单服务代理模式进行了扩展，引入了路由服务请求的概念。
The service selector pattern extends the simple service proxy pattern and introduces the concept of routing service requests.
路由采用与服务选择器相同的方式确定，而路由后应用到服务请求的转换将确定目标服务和接口。
Routing is determined in the same way as for the service selector pattern and transformation is applied to a service request after routing has determined the target service and interface.
服务选择器（路由器）
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