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    Once upon a time, a fox was walking along a road, he saw some beautiful grapes hanging a high wall. He stopped to look at the grapes. They looked nice to eat. The fox wanted to eat the grapes very much, but he couldn't reach them. So he jumped and jumped until he was very tired.

    Finally he stopped jumping and walked away with his nose held high. He said, “I don't need those grapes. They look nice but I'm sure they are sour."

In our daily life, when people can't get something they want, they may say, "The grapes are sour.”

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