回到命令行和基于字符的菜单时代，那时界面通常间接地为用户提供服务。
Back in the days of command lines and character-based menus, interfaces indirectly offered services to users.
许多DOS程序虽然带有一些图形用户界面的特征(例如菜单)，但它们并不是基于图形的。
Many DOS programs include some features of GUIs, such as menus, but are not graphics based.
许多DOS程序虽然带有一些图形用户界面的特征(例如菜单)，但它们并不是基于图形的。
Many DOS programs include some features of GUIs, such as menus, but are not graphics based.
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