Now learning is really too little, I felt that I was too naughty, I have some time I think is where to play, no longer as before to learn recently, co-workers said about threat defense, but when I heard the threat defense, I do not know what is, I also feel shy to ask them, I can only sit and listen to them, then I think, this threat defense knowledge is really very useful, I also should learn a little ah, or else when the next time they spoke again, I still do not know it how embarrassing ah, so I just think of how to enrich themselves, and learn some knowledge in this area, so if we can use it, it is also very good, in my opinion, knowledge learning is very useful The