Speaker use a finite set of rules to produce and understand an infinite set of sentences.
说话者可以运用一组数量有限的规则来表达和理解数量无限的句子。
It introduces notions of composite attribute expression and composite permission, defines different multiple role groups and makes a finite set of rules to assign user to roles.
该模型引入复合属性表达式和复合权限的概念，制定授权约束规则，为用户分配多组角色。
Therefore, the language could not be described by a finite list of examples, but only by a set of rules, called a grammar.
因此一种语言没法被描述成于一个有限实例的列表，但是可以被描述成一个语法的集合。
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