第二个命令创建了一个公钥数字证书，供收件人解密和验证您的消息。
The second command creates a public key digital certificate for the recipient to decrypt and verify your messages.
否则，收件人必须先为自己获取一个证书，然后通过一个已签名的电子邮件消息把它发送给您。
Otherwise the recipients must first obtain a Certificate for themselves and then send it to you in a signed email message.
否则，收件人必须先为自己获取一个证书，然后通过一个已签名的电子邮件消息把它发送给您。
Otherwise the recipients must first obtain a Certificate for themselves and then send it to you in a signed email message.
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