As a matter of fact I don’t know what is this threat defense, because I rarely go to research in this area, so I have been to this aspect of knowledge don’t why understanding, so now, I really is a bit like to learn some knowledge concerning the threat. The. This few days, I found that my colleagues are in the study of knowledge regarding the threat defense, when I found it, I don’t know what to say, I think, I should also is to learn about these things, so on my own or ah, but I also think that the threat defense knowledge really is quite useful ah, if I later met or do not understand the words, it really is some awkward, so I think is to learn some knowledge of this.