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.
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