To do this work for so long, I think I learned knowledge is really a lot, but yesterday when I met the Targeted Attacks problem, I found that I still have a lot to learn knowledge, before may be too proud. At that time, see the Targeted Attacks problem, I really do not know how to solve, because this is the first time I met on Targeted Attacks, and my knowledge of Targeted Attacks also do not understand, then ask someone else, just to solve the problem, so I think I am still me learn some knowledge about Targeted Attacks, so, next time you encounter yourself also know how to solve.