"I can always tell a graduate class from an undergraduate class," observed the instructor in one of my graduate engineering courses at California State University in Los Angeles. "When I say, 'Good afternoon,' the undergraduates respond, 'Good afternoon." But the graduate students just write it down."
Many years after receiving my graduate degree, I returned to the State University of New York at Binghamton as a faculty member. One day in a crowded elevator, someone remarked on its inefficiency. I said the elevators had not changed in the 20 years since I began there as a student.
When the door finally opened, I felt a compassionate pat on my back, and turned to see an elderly nun smiling at me. "You'll get that degree, dear," she whispered. "Perseverance is a virtue."
A Wolf in sheep's clothing
A wolf wanted to eat the sheep, but he was afraid of the vigilant shepherd and his dogs. One day the wolf found the skin of a sheep. He put it on and walked among the sheep. A lamb thought that the wolf was its mother because his skin looked like hers. So it followed the wolf. Soon after they had left the dogs, the wolf came at the lamb and ate it up. For some time he succeeded in deceiving the sheep, and enjoying hearty meals.
狼想吃羊，但是他害怕警惕的牧羊人和牧羊犬。 有一天狼发现了一块羊皮，便披着它混入羊群。 一只小羊羔把这只披着羊皮的狼误认为自己的妈妈，被领出了羊群。 狼成功地欺骗了羊群，吃掉了小羊羔。
The crow, rabbit and fox
The crow was sitting on the tree doing nothing all a day.A small rabbit saw the crow,and asked him:"Can I also sit like you and do nothing all day long?" the crow answered:"sure ,why not?" So the rabbit sat on the ground below the crow,and rested.All of a sudden. A fox appeared,jumped on the rabbit and ate it .moral of the story is :To be sitting and doing nothing ,you must be sitting very very high up!