An index page at the root of the site acts as the main page of the Web site, a downloads area, and an area for administrators (hereafter called admin).

把站点根目录下的索引页作为 Web 站点、下载区域以及管理员区域的主页面。

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For larger tables, the root page stores pointers to the intermediate level index pages or to leaf-level pages.

对于很小的表，只需一个根索引页即可。大表可能会有很多中间页。

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