In this case, the restriction selects all resources that have an issue property where the value of that property is of class issue.

在这个例子里，约束条件选择所有具有issue特性并且该特性的值属于类issue的资源。

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This restriction is lifted in Groovy; you can change the values of variables in a containing scope from within an anonymous inner class.

Groovy则消除了这种限制，在Groovy中，匿名内部类可以修改外部的变量值。

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By its subclassing from this restriction, the RelevantResource class is a sort of virtual class that includes a set of all resources that meet the restriction.

通过从这一约束条件划分子类， RelevantResource 类成为一种包含一个所有满足该约束条件资源集合的虚拟类。

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