状态窗通常是被用户的动作所触发(如注册或登录)，并且出现于主内容之上，就像桌面应用中的一个窗口。
Modal Windows are always triggered by a user action (e.g. signing up or logging in) and appear on top of the main content, like a window in a regular desktop application.
不管它是一个搜索表单、一个登录窗口或是一个多页的注册向导，用户使用表单真正向应用表达自己。
Whether it's a search form, a login screen or a multi-page registration wizard, forms are how the user really expresses themselves to the application.
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