该系统建立于老式命令行界面之上，用户需要与干巴巴的提示性语言打交道，比如C:\>之类。
It was based on an old-fashioned command line interface that confronted users with surly little prompts such as C:\>.
设计得好的图形用户界面可以使用户从学习复杂的命令语言中解放出来。
Well-designed graphical user interfaces can free the user from learning complex command languages.
自然语言界面允许用户使用自然的语言如英语与计算机进行交互，而不是使用计算机语言、命令行界面，或者图形用户界面。
A user interface that allows people to interact using a human language, such as English, as opposed to a computer language, command line interface, or graphical user interface.
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