这些社交网络具备复杂的用户访问权限等级。

These social networks involve a complex set of user access levels.

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等级系统中的访问控制问题有着重要的实际意义。

It is significant in fact that access control schemes in hierarchy.

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等级系统中的访问控制问题有着重要的实际意义。

It is significant in fact that access control schemes in hierarchy.

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