从用户交互角度看，ipad界面绝不该仅仅是放大了的iphone界面。
But from an interaction design perspective, an iPad user interface shouldn't be a scaled-up iPhone UI.
从计算机科学的角度看，重点是交互特别是一个或多个人类和一个或多个计算机之间的交互。
From a computer science perspective, the focus is on interaction and specifically on interaction between one or more humans and one or more computational machines.
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