That file was electronic message, so suddenly in about 1971, we had e-mail. So an e-mail was pretty much the major use of the internet for the next 20 years.

那种文件就是电子消息，如此突然的，约在,1971年，我们有了电子邮件，电子邮件,基本上是此后20年互联网的主要运用形式。

麻省理工公开课 - 媒体、教育、市场课程节选

> David: An error message of some sort like "file not found" or "commands not found."

>，大卫：会出现一个错误信息像“没找到文件“,或“没找到命令“

哈佛公开课 - 计算机科学课程节选