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。
Internet mapping services and GPS navigation systems are extraordinarily useful.
互联网地图服务和GPS导航系统非常有用。
Internet mapping services and GPS navigation systems are extraordinarily useful.
互联网地图服务和GPS导航系统非常有用。
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