Man: Hey, do you know the bus company network system crashed?
Woman: I heard about it several days ago!
Man: That is unbelievable!
Daniel: Daddy, can you tell me what they are talking about?
Benjamin: They are talking about the network of the bus company.
Daniel: Why is their network not working?
Benjamin: Because of the IC cards.
Daniel: The IC card?
Benjamin: Yes, Beijing is a big city and there are about 7,000,000 people using IC cards on buses.
Daniel: And?
Benjamin: All the people were checking the balance of their cards on the Internet at the same time, that's why the system crashed.
Daniel: Oh, that is horrible!