C518 The power of mathematics

"Teacher, you …"

When Zhuge Liang saw Zhang Cang's drawing, his eyes were instantly fixed on it, unable to shift away.

Weakness in the Chang'an City Wall... Even as Xiao Wen's student, whether it was his knowledge, storage, or experience, he had accumulated a good amount. But when he saw the content on Zhang Cang's drawing, he could not hide the astonishment in his heart