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The privilege control of the users role hierarchies based on RBAC 基于RBAC中用户角色继承的权限控制方式
This scheme describes the relation of role hierarchy with DAG androle's permissions withACM (Access control mask), solve key technology problems. 该方案采用有向无环图描述角色的继承关系，用访问控制掩码描述角色的权限，解决了基于角色访问控制在实现中的关键问题。
Abstract:Based on the analysis of role permission and role hierarchy, an extended role-based access control(RBAC) model?ERBAC is put forward to mend the imperfections of the famous RBAC model. 摘要:针对传统的RBAC模型的不足,对角色权限及角色层次关系进行了分析,提出了一个改进的角色访问控制模型??ERBAC;
The orient has been playing an active role in the world economy. 亚洲一直在世界经济中发挥积极作用。
The leading role is played by a complete unknown. 演主角的是一个毫无名气的演员。
Am I really fitted for the role of director? 我真能胜任董事一职吗?
She play a notable role in compile the book. 在编写这本书的过程中，她起了显著的作用。
She sang the title role in Carmen. 她在歌剧《卡门》中演唱卡门这一角色。
He was cast as Othello/cast in the role of Othello. 选派他扮演奥赛罗的角色。
He played a passive role in the marriage. 他在婚姻中扮演了一个被动的角色。
He's a natural for the role of Lear. 他是李尔王这一角色的理想人选。
She played a minor role in the opera. 她在那出歌剧里扮演了一个小角色。
Public transportation played a subsidiary role. 公共交通起辅助的作用。
He denied any role in the robbery. 他否认曾参与这起抢劫案。
A leader who assumes the role of a messiah. 充当救世主角色的领导人
She acted as a minor role in the play. 她在剧中扮演了一个次要的角色。
role hierarchies 角色等级
A person having a leading or starring role. 主要演员，主角担任领导或主要角色的人
One's assigned role or function. 角色某人指定的角色或职务
She acted out the role of a wronged lover to make him feel guilty. 她扮作受了冤枉的情人，好让他感到内疚。