I'm naked

　　Our physics professor was struggling to draw the class into discussion of Archimede's principle of water displacement. He told us that Archimede noticed that when he got into a pool at the public bathhouse, the water rose spilling over the edge. Excited at his discovery, he ran down the street yelling, "Eureka, eureka!" The instructor asked if anyone knew what that meant.

　　One student stood up and answered, "I'm naked ! I'm naked!"

　　我们的物理教授千方百计引导我们讨论阿基米德的.排水原理。他告诉我们阿基米德去公共浴池洗澡，他进入池子，发现水涨高了，溢出池沿。他对这一发现十分激动，跑到街上高叫：“Eureka，Eureka!”教授问我们谁知道他喊的是什么意思。

　　一个学生站起来答道：“我光屁股啦，我光屁股啦!”