数学单循环公式

简介：Not only recruiting warriors, but also digging trenches outside the city, and then digging two or three deep trenches to act as a barrier. Bazhou is a plain with no moat. The attackers can rush directly to the city wall and erect ladders. This is one of the reasons why it is difficult for small towns in Bazhou and even the entire Gyeonggi Plain to hold on.