除了默认角色，每个多维数据集还有一个默认策略。
In addition to the default role, each cube has a default policy.
要限制角色可以访问的一个维度的多维数据集和成员，需要设计和部署一个安全模型。
To limit the cubes and members of a dimension that a role can access, you need to design and deploy a security model.
默认情况下，如果角色有权访问一个多维数据集，那么它也有权访问一个维度的所有成员。
A role that is allowed to access a cube is allowed to access all the members of a dimension by default.
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