该元素描述要保护的页面集合和关联的安全约束。
This element describes the collection of pages to be secured and associated security constraints.
wiki： wiki是侧重于相关内容的页面集合。
Wikis: a wiki is a collection of pages which focus on a related content.
我觉得我需要的信息位于一个普通的页面集合中，但是我还没有检查这些页面的具体布局。
I had a sense that the information I wanted was on a general collection of pages, but I had not yet examined the specific layout of those pages.
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