注意这里的显示，进程可能有一个大的地址空间，但是很少见，就是说小的地址空间的区域(页面)通过页表指向物理内存。

Note that as shown here, a process may have a large address space, but it is sparse, meaning that small regions (pages) of the address space refer to physical memory through the page tables.

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样式表通知浏览器把designers和blurb作为块区域，而忽略用于显示的script元素。

The stylesheet instructs the browser to treat designers and blurb as block regions and to ignore script elements for display purposes.

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布局区域本身不能在浏览器上显示，但是您可以使用标记或表来模拟布局(标记是一种HTML代码，用于在页面上任何位置放置一段内容)。

The layout region itself cannot be presented to browsers, but you can mimic the layout with tags (HTML code that allows you to position a block of content anywhere on the page) or tables.

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