一个美国老人告诉我,他的牧师讲的一个 关于鹰的故事,让他在即将过93岁生日时重 返学堂。那个故事是这样的: 鹰是自然界最长寿的鸟,它们通常可以活 到70岁。然而,在活到40岁的时候,鹰的爪子 开始老化,无法有效地抓住猎物;它们的喙 An American old man told me a story about his eagle told by his pastor that he should return to school soon after his 93rd birthday. That story is this: The eagles are the longest lived birds in the world, and they usually live to be seventy. However, when it reaches the age of 40, the eagle's paws begin to age and can not effectively hold prey; their beak