一级理论和二级理论的区别

Qin Shujie said lightly, then turned to look at Zhou Xiaogang's parents, "I don't have that much time to spend with you today, so I'll stop here today." In addition, I want to give you a piece of advice. No matter who you are or what your background is, if you don’t compensate one billion, then you will pay with your life. I will do what I say!...