在打印文件的时候，CUPS使用MIME(多用途internet邮件扩展)类型确定合适的转换过滤器。

CUPS USES MIME (Multipurpose Internet Mail Extensions) types to determine the appropriate conversion filter when printing a file.

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安全多用途Internet邮件扩展（Secure Multipurpose Internet Mail Extensions，S/MIME）允许将数字签名附加到电子邮件消息上，这样接收方就可以验证签名者的身份。

Secure Multipurpose Internet Mail Extensions (S/MIME) allows digital signatures to be attached to e-mail messages, such that the recipient can verify the identity of the signer.

youdao

安全多用途Internet邮件扩展（Secure Multipurpose Internet Mail Extensions，S/MIME）允许将数字签名附加到电子邮件消息上，这样接收方就可以验证签名者的身份。

Secure Multipurpose Internet Mail Extensions (S/MIME) allows digital signatures to be attached to e-mail messages, such that the recipient can verify the identity of the signer.

youdao