In fact, a few years back, I developed an app for the iPad which does exactly this. It's called Avaz, and the way it works is that kids select different pictures.
事实上，几年前， 我在iPad上开发了一个app 就是这样的运作的。它叫做Avaz， 它是这样运行的：孩子们选择 不同的图片。