Teacher:Why do we sometimes call the Middle Ages the Dark Ages?
Betty:Because they had so many knights.
老师：为什么有时我们称中世纪为黑暗时代呢?
贝蒂：因为那时有许多骑士.
A bunch of great,DEAD scientists were playing hide-and-seek in heaven.When it's Einstein's turn to be the seeker,he counted untill 100 and opened his eyes.All the others were hide,but only Newton were still standing there.
一群伟大的科学家去世后在天堂里玩藏猫猫.轮到爱因斯坦抓人,他数到100睁开眼睛,看到所有的人都藏起来了,只有牛顿还站在那里.