If the user clicks another link or button, another request is made to the server, and the current page is replaced with the new page that the server returns.
如果用户单击其他链接和按钮,就向服务器发出另一个请求,用服务器返回的新页面替换当前页面。
When a page is revised, the cached version is invalidated and replaced.
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。
This is a variable that is replaced by the Velocity template engine when the page is generated.
在生成页面时,Velocity模板引擎会替换这个变量。
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