As for this, I just want to say that I understand everything, and I don't explain what I don't understand. After all, I know it well, and I'll have a fine look. Don't ask me what's wrong with me. The interests involve too much. It's not good for you and me. Just don't know. The rest of me can only say that the water is deep and involves a lot of things. Details of your own is very difficult to find, most of the Internet has been deleted clean, so I can only say that understand all understand. The people who know it have basically made a profit on shore. Those who don't understand will never understand. The key to understand is to understand by themselves. You don't know who knows. You can't ask for advice. Everyone hides it for fear that others will know what they know, and if they do, they will reap what they don't understand. You don't even know you don't understand. It's just that sometimes, some people don't understand some things and pretend to understand them. In fact, I don't know what I don't know. Other people understand enough, not only understand, but also understand beyond this range. But some people who don't understand let this person understand completely. So those who don't understand will never understand. They can only pretend to understand what others say. Just nod their heads. In fact, I understand what you know. Who let us all understand, and there is no need to pretend to understand what we don't understand, After all, there are a lot of things that I can't understand. People who understand this kind of thing don't need to say it. Those who don't understand come to ask seven questions and eight questions. Finally, they tell him that he can't understand it. Even if they understand it, it's not good for him to know too much. So we'd better not to understand if we don't understand. It's not good to understand too much.