当你更进一步，回来在做即可。不要让这些东西拖慢你一开始的学习或是增加你的认知负担。
When you're further along, come back to it — but don't let it slow down your initial learning or add to your cognitive load.
人机交互的目的就是降低使用者的认知负担，使使用者和计算机能够更自然更和谐地进行交互。
The main goal of Human - Computer Interaction is to make software easier to use and understand, to make human and computer interact in harmony.
普适可用性的原则就是让用户界面的设计贴近于用户的任务模型，拉近了系统与用户的距离，降低用户使用系统时的认知负担。
The user interface based on pervasive usability is closer to the user's task model, and can reduce their cognitive burden when operating the system.
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