行4编码字符串Double secret probation并使用Base64将加密了的这个字符串转变为可打印的字符，以便于用电子邮件等程序传输。

Line 4 encodes the string Double secret probation and USES Base64 to turn the encrypted string into printable characters that can easily be transmitted over E-mail, say.

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注意，清单10中的最后一行，它将当前的span数据设置为未加密文本，而不是“BEGIN pgp…”。

Note the last line in Listing 10 which sets the current span data to the unencrypted text instead of the "BEGIN PGP."..

youdao

当添加密钥到ssh_known_hosts文件时，应确保密钥没有被分成多个行，并确保主机的条目在一个单独的行上。

When adding keys to the ssh_known_hosts file, ensure that the key is not split into multiple lines and that each host's entry is on a separate line.

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