伊索寓言中有一个故事：一匹狼的喉咙里鲠了根骨头他便许诺重金请来一只鹤，叫他把头伸进它的嘴里，用他那长长的喙将骨头取出来。当这只鹤替狼把骨头了出来后；向狼索取酬金的时候，狼磨了磨牙齿，冷笑着说：“怎么？让你的头从一只狼的嘴里安全地出来，这种幸运，难道还中以 One of the stories in Aesop’s Fables is that a wolf has a stump in the throat of a wolf. He promises that he will bring in a crane and put his head into his mouth and remove the bones from his long beak. When the Crane wolf got the bones out; when the wolves were being paid to the wolves, the wolf grinded his teeth and sneered and said, "How? Let your head come out safely from the mouth of a wolf. Is it still in