Sam and Jason are dormmates... Sam: What are you doing with that broke n radio, Jas on? Jas on: I'm trying to fix it. Sam: But you do n't know anything abo ut circuits (电路). Jason: I know. I just want to see if I am born with this kind of ability. You know how great people discover their talents by accident? I must be special for something too. Let me start with this old radio...