Error把一般问题告诉用户，例如不正确的密码、失效的会话等。
Error Informs the user about general problems, for example, incorrect passwords, an expired session, etc.
数字密钥可以让客户通过输入独一无二的密码来登录，这种密码几秒钟就失效。
These devices enable customers logging into their accounts to enter unique pass codes that change every few seconds.
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