An example of this would be putting photos in an email attachment.

举个例子，把照片放入邮件附件。

Nothing is more frustrating than waiting for an email attachment to download.

没有什么比等待电子邮件附件下载更令人沮丧的了。

And it can't be an email attachment.

电邮附件那种是不行的。

Never open an email attachment from an unknown source.

切勿打开来自未知来源的电子邮件附件。

If your data is big enough, like an email attachment, it might get broken up into many packets.

如果您的数据足够大，例如电子邮件附件，它可能会被分解成许多数据包。

Phishing occurs when someone opens an email attachment that looks real. But the attachment is actually a virus that immediately infects the user's computer.

当人们点开看起来像真的邮件附件时，网络钓鱼就发生了。但这种附件其实是病毒，能立即感染用户的电脑。