A man was looking for things of old times. One day he came to a village and found a blue bowl which looked very old. The bowl was on the ground and a cat was drinking milk from it. A farmer, the owner of the cat, was lying beside the bowl. In order not to draw the farmers atten tion to the value （价值） of the bowl, the man said to him in a soft voice, What a nice cat you have！ Won't you sell it to me？
How much would you give me for it？ the farmer opened his eyes and asked."Twenty dollars Would it be enough？
A few minutes later, the farmer agreed. After he paid the farmer he man said. "My cat will certainly feel thirsty. May i take the bowl so that the cat can have milk？
But the farmer said，"I'm sorry I can't give it to you. Thanks to the bowl, I have already sold twenty cats.