经典的例子便是GUI，程序必须响应用户的某些行为，比如按键或是鼠标移动。
The classic example is a GUI where your program must respond when the user does something like press a key or move the mouse.
交互式应用程序(如文本编辑器)不需要处理大量数据，但是它需要及时响应用户的按键。
An interactive application like a text editor generally doesn't need to process large volumes of data, but it is important that it be responsive to user keystrokes.
它的两个主按键不是机械的，而是电容触摸传感器。它还有细微的扬声器，每当按击时都会有声音响应。鼠标还有一个滚球使用户能朝任意方向滚动页面。
The two main buttons are not physical, but instead use capacitive touch sensors with a tiny speaker to provide audible feedback for each click.
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