听力原文:W: Excuse me, do you know how it works? M: Yes. Put the washing inside, shut the door, the money goes here. Then when the machine starts, you have to put the soap powder in through here. W: Is that all? M: Yes. W: But is there anything I should do when it works? M: You don't have to do anything else until the machine stops. W: Thank you very much. What can we learn from this conversation?