translation.en: Now, when they tried this on an iPhone 3GS, this is a graph of the perturbations that were created by the typing, and you can see that it's very difficult to tell when somebody was typing or what they were typing, but the iPhone 4 greatly improved the accelerometer, and so the same measurement produced this graph.
translation.zh: 那么当他们在用iPhone 3GS做这实验时， 这是他们从打字所得到的 扰动图，而你可以了解到这是很难 判断什么时候有人在打字 或者他们打过了什么字， 但是iPhone 4在加速规上有很大的提高， 因此同样的测量 所得到的图是这样的。