user name or email address

You could automatically check that a user name or email address is not already in use, validate the form without refreshing the page, or even submit the form and display a result dynamically.

可以自动检查一个用户名或电子邮件地址是否已经不再使用，验证表单而无需刷新页面，甚至提交表单并动态显示一个结果。

More generally, the right side can be any kind of sequence (string, list or tuple). For example, to split an email address into a user name and a domain, you could write.

更普适的情况下，等号右边以是任意一种序列(字符串、列表或者元组)。比如，要把一个电子邮件地址转换成一个用户名和一个域名，可以用如下代码实现。

If you forget your User Name or password, Please click here to retrieve password, the password will be sent to your Email address.

如果您忘记密码或用户名，请点击'找回密码'并输入用户名，我们的系统将自动发送密码到您的有效邮箱中。