随着用户对站点的深入访问，此时可以显示更多的导航元素。
As the user digs deeper into the site, more navigation elements display.
如果人们真的希望更加深入的理解它们，就需要访问这些源代码。
If people really want to understand more deeply, they have access to source code.
该例表明，你可以对你需要的单个资源进行访问控制，甚至深入到非常细粒度的实例级别。
This example shows that you can control, even down to a very fine-grained instance level, access to individual resources if you needed to.
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