One hot summer day a fox is walking through an orchard( 果园 ). He stopped before a bunch of grapes.

"I'm just feeling thirsty," he thinks. So he jumps up, but can not reach the grapes. One, two, three, he jumps up again, but still, he misses the grapes. The fox tries again and again, but never succeeds. At last he decides to give it up.

He walks away, and says “I am sure they are sour.”