一级理论和二级理论的区别

It was Ning Cheng's first time to come to Tianmen Realm, but the reputation of the two heroes of the universe had already been spread throughout Tianmen Realm. Sure enough, after Ning Cheng said that he would seek revenge afterwards, several of the many strong men who surrounded Ning Cheng began to waver. Those who have practiced to their level know that it may be easy to defeat a strong person, but it is really not easy to kill a strong person....