據說小学生几秒就做出；高中生几分钟；大学生半小时以上；博士可能要一辈子......
What takes an elementary school student just seconds to do;
takes a high school student several minutes;
takes a college student half and hour and up;
and takes a Ph.D a lifetime…
請看題：
the question is:
來源: chinasmack
from: chinasmack
答案：
answer:
倒過來看看:)
look at it upside-down :)
原文：http://www.cnblogs.com/prajna/p/3775985.html