听力原文:M: I am pleased we've reached an agreement on the amount of materials. We just have a very tight budget. Thank you for your understanding. W: I' m glad you are happy. But please help us next time. We are not making any profit this time. M: I know it' s not giving you a margin. I promise that we will order at least 3,000 units every year! W: That's a deal then. What are they doing?