在网上偶然看到的一个小故事: There was a guy sitting in the library in front of me, and on his T-shirt it says: "Do you want to know how to keep stupid people busy? check the front of the shirt" I was so curious about the answer, so I walked by him several times to see what's in the front of his shirt, pretending I was doing something else.... It was not that easy, but finally I made it! and it says: "Do you want to know how to keep stupid people busy? check the back of the shirt" 要是每天都能这样“忙碌”也不错。