All anchor element text will have a different shade of blue depending whether the link was visited or not.
所有的定位点元素文本都有一个不同的蓝色阴影，这取决于链接是否访问过。
When a text is blue, the user is used to thing it is a link, and if it is purple, that it is a visited link.
当文本是蓝色的时候，用户认为是链接内容，如果文本为紫色，就是可访问的链接。
Other, less-widely supported pseudo-classes include: first-child, : link, : visited, : active, and: focus and: lang. Note that a pseudo-class can be applied to a specific element type, like this.
还没有得到广泛支持的其他伪类包括：first - child、：link、：visited、：active、：focus和：lang。
When Professor Zhang Yibin visited London, he was moved to visit the grave of a man whose work he had studied and who is an important link between the thinking of our two countries - Karl Marx.
张异宾教授访问伦敦期间，他专程去拜谒了他所研究的一个人的墓地，这个人亦是我们两个国家思想的重要连接纽带，这个人就是卡尔·马克思。
Specifies how the link looks if the page it links to has already been visited.
设定当连接过去的网页已经看过时，该连接的样式。
Once the link is visited, the font color becomes blue.
一但被连接的页面有被看过，连接文字颜色就变为蓝色。
To change the visited link color.
改变访问过的链接的颜色。
To change the visited link color.
改变访问过的链接的颜色。
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