<b>If you have an existing personal key</b> for this email address, you should import it. Otherwise you will not have access to your archives of encrypted emails, nor be able to read incoming encrypted emails from people who are still using your existing key.
<b>若您已有此邮箱的个人密钥</b>，应该直接导入该密钥，否则将无法再访问先前加密过的邮件，以及其他人使用您现有密钥加密发送给您的邮件。