一些数据库模式描述了在你的案文，规定关系指明前进，因此，不支持专案资料的要求。

Some of the database models described in your text require that relationships be specified in advance, thus not supporting AD hoc requests for information.

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标准模型中并没有规定如何在部署后修改角色-约束关系。

There is no provision in the standard model for modifying the role-constraint relationship subsequent to deployment.

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尽管这样的案例很罕见，但人们早已要求法院详细规定种族关系法的适用范围。

Although rare, the courts have been called on to elaborate the scope of the Race Relations Act before.

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