每个镜象站点都被请求有一个可用的核心服务，除了核心服务还有另外的服务管理员可选择提供。
Every mirror site is required to have a set of core services available. In addition to these required services, there are a number of optional services that server administrators may choose to offer.
每个镜象站点都被请求有一个可用的核心服务，除了核心服务还有另外的服务管理员可选择提供。
Every mirror site is required to have a set of core services available. In addition to these required services, there are a number of optional services that server administrators may choose to offer.
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