A: Look, Mona ！?
B: Oh, it's a person computer. It is widely used in today's world.
A: You are right. Do you know ?
B: Yes, it was invented in 1971.
A: ?
B: It is used for helping us work , study , send e﹣mails and so on.
A: ?
B: It is said that it was invented by some American scientists.
A: By the way, what are you going to be when you grow up ?
B: and invent many useful inventions for our motherland.
A: OK. Let's work hard to make our dreams come true.
