无效页面通常缺少结束标记，HTML标记嵌套不正确，甚至css样式标记的问题。
Invalid pages often have missing closing tags, improper nesting of your HTML tags, and even problems with CSS style tags.
GWT的网址删除工具，可以从Google搜索结果中移除无效页面。 下面是具体步骤说明。
One of the most important tools provided in GWT is the Remove URL tool, which allows you to remove invalid pages from Google search results.
如果用户输入无效的数据片段，应用程序可立即提示用户，在用户提交页面之前改正问题。
If the user enters an invalid piece of data, the application can immediately prompt the user to correct it before he submits the page.
如果曾用于生成特定页面的标记的某个门户资源的服务器端状态发生更改，需要重新生成此页面，因而缓存的视图会变为无效。
If the server side state of a portal resource that was once required to generate the markup for a specific page changes, this page needs to be regenerated, and thus the cached view becomes invalid.
如果您所提供的ID和口令是无效的，那么您将看到一个错误页面。
If the id and password you supplied are invalid, you will be directed to an error page. Otherwise, a list of employees with their details will be displayed as shown in Figure 16 below.
这将是当用户试图用无效凭证登录时所显示的页面。
This will be the page which is displayed when a user attempts to log in with invalid credentials. It can be as simple as Listing 8
通过使用缓存代理，每个页面都只需从门户交付一次，然后此页面将驻留在缓存中(直到内容无效时为止)。
By using caching proxies, each page would be delivered from the portal only once and then reside within the cache (until the content becomes invalid).
如果我们现在认为速度是最主要的问题，那么用户对索引页面上无效说明的忍耐力也将成为影响用户体验的因素。
If speed is now supposedly the issue, then the patience of user's when faced with poor or useless descriptive text for indexable pages will also surely become a factor.
当页面发生变化时，缓存后的页面就会变为无效并被替换掉。
When a page is revised, the cached version is invalidated and replaced.
如果你删掉了一个页面或者网站的部分内容，你可以通过修改robot. txt预防蜘蛛爬行和索引那些无效链接。
If you've removed a page or section, you can use the robot.txt to prevent the spiders crawling and indexing the broken links.
无效的页面档名，请换一个。
欲了解更多有关无效点击的展示和信息，请参阅此页，其中包括一个活动链接到我们的常见问题页面无效的帐户禁用到期。
For more information about invalid clicks and impressions, please refer to this page, which includes a link to our FAQ page for accounts disabled due to invalid activity.
当我刷新页面的CSS文件也是无效的。
当我刷新页面的CSS文件也是无效的。
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