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。
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。
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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