You can assert that a string, table, or a form-input element with a given label is present or not present in the page.
可以对字符串、表或者带有指定标签的表单输入元素是否存在于页面上进行断言。
For a particular virtual page, a page table entry will give a corresponding physical page or note that the page is not present (indicating a page fault).
对于一个特定的虚拟页，根据一条页表记录可以找到对应的物理页，或者是页无法找到的提示(说明存在一个页错误)。
This way, we control which content to present based on whether the page template was being used for the home page or not.
这样，就可以根据页面模板是否用于主页来控制显示哪些内容。
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