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Navigation goes from one page to the next, not from one frame to the next, so links go to the next outer page.

导航从一个页面进入下一页面，而不是从一框架到另一框架，因此链接进入下一个外部页面。

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If navigation was not from one outer page to the next, you would need to synchronize the body content with the proper left navigation frame as users browse the site.

如果导航不是从一个外部页面到下一个外部页面，那么当用户浏览网站时，您就需要用适当的左侧导航框架与正文内容同步。

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