A significant portion of the total excise of an interface is in having to explain things to the application that it should already know. For example, in your word processor, you might often reverse-out text, making it white on black.

• 界面附加工作的很大一部分来自向程序解释它应该已经知道的事情，例如在文字处理器中你可能要经常反白文本，在黑色底版上写白字。