When Wang Qian entered the classroom, Zhao Zhiyi, Qin Yuanfan, and Wan Jinyan were not there, she looked at her seat, because she was less accompanied and looked lonely, she still walked over, but she no longer had the extra mood to frolic with her classmates.

After a while, Xu Yun came in with a stack of papers, and when he entered the door, he swept the three empty seats that were particularly eye-catching and the lonely little girl surrounded by the empty seats, and sighed silently.

He propped his hands on the lectern, stretched his upper body forward slightly, and said with a smile: "Sure enough, as I expected yesterday, the places you have been to are really countless, and you basically go to the cities around Bianliang to visit relatives on weekdays." Well, is Qin Yuanfan here? ”

Zhu Zhen hurriedly stood up and explained in a somewhat flustered manner: "Master Xu, Qin Yuanfan didn't come today, and then Zhao Zhiyi and Wan Jinyan didn't come either, it should have been delayed by the matter, but I didn't mean to miss your class!" ”

Xu Yun motioned for Zhu Zhen to sit down, "It's okay, I understand the cause and effect, and I won't blame them." Well, when Qin Yuanfan is mentioned, it's because he has really been to a lot of places, but does anyone know why? ”

Wang Qian was still pondering what Xu Yun's sentence "understand the cause and effect" meant, and the pot exploded around him.

"Master Xu, don't you know, Yuanfan's father is a well-known businessman in Bianliang, and the caravan he sent out ten years ago went south to the Hopeless Sea and brought back a lot of rare things from the sea."

"Yes, yes, yes, listen to my father, it was those rare things that made Master Qin get the first pot of gold, and since then he has bought land and shops in Bianliang to do business, and now he has become the largest businessman in Bianliang."

"Not only that, in addition to the Great Song Dynasty, many countries have cooperated with Master Qin, the Mongolians exchanged cattle and sheep with Lord Qin for the silk of the Great Song Dynasty, and the medicinal materials in southern Xinjiang were also purchased by Master Qin."

"Hmmm! Therefore, we Bianliang people all know that Master Qin's private treasury is more abundant than the treasury of the Great Song Dynasty, and now the officials of the Great Song Dynasty are not riveting to come to Master Qin! ”

"But Master Qin is a very good person, I have never seen him collude with any big official, every year he gives porridge and builds sheds for the poor, he is kind and charitable, and he is a living Bodhisattva in the eyes of the poor!"

"Yes, Uncle Qin is very good, he loves to laugh, Yuan Fan was fat when he was a child, and he often followed Uncle Qin's caravan to go north and south in order to lose weight, and he has been to many places." Wang Qian couldn't help but say, she had never seen an adult who loved to laugh more than Uncle Qin, she and Yuanfan could be so iron, to be honest, to some extent, it also had a lot to do with her love and admiration for Uncle Qin.

Xu Yun nodded clearly, "That makes sense, do you know that since ancient times, countless people in every dynasty and generation have worked hard to make geographical chronicles, what is the map?" ”

"I think it's a division of the state capital, the territory of the Great Song Dynasty is vast, if you don't know the geometry of the area, where it is barren, and where it is rich, how can it be fairly divided?" Li Shui said.

Xu Yun smiled lightly and nodded, not saying yes and no, as if waiting for the next answer.

Jiang Shike continued: "Master Xu, I don't know if it's right or not, just talk about it, don't you mind?" ”

Xu Yun smiled good-naturedly: "Don't worry, say it boldly." ”

"Hehe, my father is a big man, and when I was young, there were a lot of military books at home, and I often read one or two. I especially remember that there is a nine-place chapter in "The Art of War", which begins with the method of using war, including scattered land, light land, contentious land, handover land, Qu land, heavy land, pan land, encirclement land, and death land. Different terrains should adopt different combat plans and choose different leading soldiers. It is because we think that to defend the land of the Great Song Dynasty, we must be familiar with the terrain and terrain in order to win all battles! ”

In the end, Jiang Shike was moved by himself, Lao Tzu was really fucking excellent, and his voice became more and more passionate. Waited for a long time, alas? Why didn't Xu Fuzi speak, no one understands my damn excellence? Jiang Shi shrunk his head and sat down, feeling shy about his unusually excited speech just now.

Xu Yun hurriedly praised: "Classmate Jiang said it very well! The military application of geographical knowledge is essential, but this is only one thing. ”

He looked around in a circle of puzzled eyes, decided not to wait for an answer, and said: "The concept of geography can be traced back to the Neolithic Age, when our ancestors derived the idea of geographical division by combining the natural geographical situation, historical and cultural background, and witchcraft, which is closely related to astronomy; Then, the concept of 'Qifu' was abstracted from the political and geographical difference order structure of the third dynasty of the Xia and Shang dynasties, and finally the concept of orientation was formed by adding mathematics. Since then, geographical knowledge has been closely related to human production, life, politics, economy, military and so on. ”

Xu Yun's voice was low and beautiful, and the students below were all immersed in it.

"Our ancestors have always been very concerned about the state of the natural environment on which they depend for survival and development, so they have developed various geographical concepts, and have accumulated rich geographical knowledge in practice.

Xu Yun was a little tired from standing, so he leaned on the lectern and continued: "Geographical documents originated in the pre-Qin period, the Qin, Han, Wei and Jin dynasties have a wide variety, and the Sui and Tang dynasties are really the heyday of development, but now, they are gradually withering...... he sighed regretfully.

"Is it because of the Great Song Mountains and Rivers?" Wang Qian pointed out to the point.

Xu Yun moved his eyes to her, and after a long time, he spoke: "The loss of Shanhe Zhi is indeed the fuse, but the fundamental reasons behind this are complicated. You must know that geography is intimately linked to all aspects of a country, and just as its prosperity and absence, its prosperity and weakness are inseparable from its strength or weakness. ”

These words are extremely bold and unconventional, and they run counter to the orthodox values advocated by the Great Song Dynasty today. And the implication of Xu Yun's words is quite explicit and ironic. Is he saying that losing a copy of the Chronicles of Mountains and Rivers can destroy the Great Song Dynasty and push it into the abyss? Why does a great country not have the ability to reproduce a single document? The Manchu Dynasty civil and military led the court to Lu, can't they think of a solution? Putting the rivers and rivers of geographical knowledge into a geographical document, are these high-ranking officials and dignitaries who are usually high and high in the world seriously joking with the people of the Great Song Dynasty?

I don't know if it's his language or his tone, so shocked that Wang Qian and the others didn't come back to their senses for a long time.

"You're exculpating yourself, are you? Who in the Great Song Dynasty didn't know that the young prime minister was demoted to a commoner by the saint because of the theft of the mountains and rivers. Wang Qian really didn't understand this person, he didn't know what he was talking about, if he was so bold, presumably if she asked, he would answer, and she happened to urgently need a truth.

Xu Yun really didn't hesitate: "As I said just now, the mountains and rivers are just a fuse, and the real reason needs to wait for a while before the truth is revealed." It's just that... When the time comes... If I am no longer there, I hope you can still remember what I said today, and look at the relationship between geography and the country and the world from a fair and just perspective. ”

Wang Qian looked at him after saying this, the broken and desperate in his eyes, she especially wanted to yell at him: Since it is a matter of the world, since it is just a fuse, why should you be alone and risky, do you really take yourself as a living bodhisattva who saves suffering? Hehe....

It's just that everyone has their own obsession, how do you know how deep that obsession is, and whether it will kill you if you lose it? No qualifications, no position.