这种情况下，在获取某个服务信息的同时，代理创建器订阅服务信息的更新，而这些信息由注册中心服务发布。
In this case proxy builder, while getting service information about particular service, subscribes to the updates of this service information, which are published to it by a registry service.
服务提供者可以使用各种技术来将自已声明或注册给服务代理。
The service providers can use various technologies to declare or register themselves to the service broker.
服务代理提供和维护服务注册中心，然而现在并没有通用公共注册中心。
The service broker provides and maintains the service registry, although nowadays public registries are not in vogue.
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