在银行开账户时，你要填一份双联式表格。
You are required to complete a form in duplicate when opening an account in a bank.
这里的一个例子如何组合的双因素身份验证工作：网站用户登录自己的账户并接受注册服务的选项。
Here's an example of how Duo's two-factor authentication works: a website user logs into his account and accepts the option to sign up for the service.
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