Later, when performing a login into a website, the user is provided with a list of email addresses he has validated, he chooses one, and clicks the login button.
之后，当用户登录网站的时候，系统会向其提供已经验证的邮件地址列表，用户可以从中选择一个，然后点击“登录”按钮。
Refback. When a Web browser user clicks a link from one page to another, the request to the second site includes an HTTP header called the referrer, with the URL of the first page.
refback：当web浏览器用户单击链接从一个页面转到另一个页面时，对第二个页面的请求包含一个http头(它被称为referrer)以及第一个页面的URL。
Two signal handlers are connected — one to quit the application when the user closes the window and another to change the greeting that is displayed when the user clicks the button.
两个信号处理器被连接起来——一个用来在用户关闭窗口时退出应用程序，另一个用来在用户点击按钮时，修改显示的欢迎信息。
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