业务服务目录提供ESB所依赖的服务路由信息，同时支持服务请求者和提供者之间的通信。
Business service Directory provides service routing information that the ESB is relying on, while supporting communications between service requestors and providers.
ESB需要某种形式的服务路由目录(service routing directory)来路由服务请求。
The ESB requires some form of service routing directory in order to route service requests.
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