一级理论和二级理论的区别

Meng Jingxiu took out another jade slip and handed it to Ning Cheng and said, Senior Brother Ning, this is the jade slip of the map from Jiazhou to Yixinghai. If I hadn't guessed, we were at the Mora River at this time. The Mora River is close to the Lost Mountains. If senior brother wants to return to Huazhou, he must cross the Lost Mountains, so...