Amy: Tom, let's draw pictures.
Tom: OK. I like drawing very much.
Amy: Let's draw pictures of traffic rules.
Tom: OK. Look at my picture. It tells you, "Stop! Don't go!"
Amy: My pictures are traffic signs (标志). Go straight on! Turn left! Turn right!
Tom: I like your pictures, Amy. And I learn a lot.
Amy: Really? That's good.