Each Proxy binding instance builds and maintains a directory mapping services provided by instances.

每个代理绑定实例都构建和维护一个目录，该目录负责映射由实例提供的服务。

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Each proxy instance has an associated invocation handler.

每一个代理实例都会有个与之关联的调用处理器。

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Each proxy instance has an associated invocation handler.

每一个代理实例都会有个与之关联的调用处理器。

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