You'll see this was written by a former student of ours.

你将会看到我以前一个学生写的程序。

哈佛公开课 - 计算机科学课程节选

And now, that you have not just the keyboard, but a device like this connected via USB can you do something like this, like a former student did.

有键盘，还有一个连上USB的设备,你就可以做一些事情了，先前有一个学生就做过。

哈佛公开课 - 计算机科学课程节选