尽管此设计非常简单，但它可能不够，从而导致某些类unix系统通过访问控制列表和其他机制对其进行扩展。
Although this design is simple, it's can be inadequate, leading some UNIX-type systems to extend it through access control lists and other mechanisms.
某些文件系统支持高级的安全特性，比如访问控制列表(acl)。
Some file systems support advanced security features, such as access control lists (ACLs).
如果存在，则必须相应地使用文件系统中的代码访问安全机制或访问控制列表，来保护包含这些文件的目录。
If so, you must protect the directory containing these files, using code access security or an access Control List in the file system, as appropriate.
服务器可以模拟客户端以进行访问控制列表(acl)检查，但是无法作为客户端访问系统对象。
The server can impersonate the client for access control list (ACL) checking, but it cannot access system objects as the client.
本文就该模型在OA系统中的应用，提出了具体的实现方案，利用用户、角色、动态权限列表和动态菜单列表，实现了系统访问权限的灵活管理和动态控制。
The paper brings out a concrete realization program with the model for the application of this model in the OA system. By using lists of users, roles, dynamic privilege and dynamic men…
本文就该模型在OA系统中的应用，提出了具体的实现方案，利用用户、角色、动态权限列表和动态菜单列表，实现了系统访问权限的灵活管理和动态控制。
The paper brings out a concrete realization program with the model for the application of this model in the OA system. By using lists of users, roles, dynamic privilege and dynamic men…
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