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

等级系统中的访问控制问题有着重要的实际意义。

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A key challenge in Web services security is the design of effective access control schemes.

一个关键的安全挑战就是要设计有效的访问控制机制。

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One of the major features of NFS Version 4 is its support for enhanced security schemes, which allow stronger authentication, fine-grained access control, and encrypted data traffic.

NFS Version 4的主要特性之一就是它对增强型安全方案的支持，该方案允许更强的身份验证、细粒度的访问控制以及加密的数据通信。

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The report also calls for tenants to be given greater access to shared equity schemes, more flexibility over their individual arrangements and for councils to have increased control over their own housing needs.

BBC: Council tenants 'rewards' urged