This riddle may thwart professors,don't feel bad.

来源: 走马读人 于 2010-01-22 12:45:45 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (28 bytes)
回答: 2 words, $20+ award 由 走马读人 于 2010-01-22 07:34:47

why don't you challenge me?

请您先登陆，再发跟帖！