The four celebrities looked at the excited faces of the children on the playground and immediately recalled their experiences at this age.

At that time, the eldest grandson Wuji took his sister to his uncle's house, eager to change the injustice imposed on him and his sister by the world through his hard work and efforts.

At that time, Niu Jinda was still a young man who didn't want to think, and his family was in decline, but he was not discouraged at all, he was like a big ball with fire, igniting the eighteenth anti-king.

Cheng Yanjin's old mother was still there at that time, but she was a little stupid, but so what? Cheng Yanjin felt that he was stupid, so he practiced martial arts desperately.

What about Xu Shiji?

At that time, Xu Shiji should have had the best life among several people, but the good days did not last long, and he was facing the advent of troubled times.

"Envy, huh?" Li Hui grinned and mocked these old men of different ages, "Don't worry, you can't enjoy it yourself, but your son can." ”

"Your grandchildren can, and so can your great-grandchildren."

Li Hui pointed to the Book Mountain, and the huge outline of this small mountain began to show between his fingers.

At this moment, Niu Jinda and Cheng Yanjin discovered that the so-called Shushan School was just a beginning.

Xu Shiji gasped, especially when he heard that the Shushan Academy was going to become an academy in the future, and what the scale would be in the future, he could no longer suppress the excitement in his heart.

With such an institution in Datang, won't there be a steady stream of talents in the future?

Although Guozijian is responsible for the affairs of the world's students, it is obvious that Guozijian is also a place where seniority is arranged, Xu Shiji doesn't understand that in the court, any position, seniority is an unspoken rule.

Guozijian can't, Shushan School can.

What Guozijian can't do, Shushan Academy can do.

What Guozijian has done, Shushan School has done better than it!

The eldest grandson Wuji didn't say much, but the trembling hand in the sleeve robe betrayed his heart, who said that Tang students can only read the sage book with one mind?

If there are a few more talents like Ma Zhou, why don't Datang last for a thousand years!

Since the incident in the black market, Li Hui has not had a good rest, and the news of the black market has reached Li Hui's desk every day.

This time, after Gong Yimu finally dictated a lot of information about the location of various hidden tunnels in the dungeon in the black market, Li Hui drew a map according to this dictation.

This picture is a classic in any era.

Under the dense buildings, under the bustling streets of Xinghuafang, there is a hidden place that is unknown, but full of rules and rights.

"Gongyimu, the culvert above here is exactly the same as the culvert in Chang'an, you designed it?"

Although Gong Yimu couldn't move his legs, his brain worked, his hands could move, he touched his beard, and said to Li Hui with a smug face: "Master Hou, what do you think of this design?" ”

"This design is good, but if you want to drain the sewage underground, you have to silt it up for a while, this is not an ordinary project, isn't the dungeon afraid of being flooded by the water? Especially when it rains. ”

Li Hui's question is very normal, looking at the drawings, the drainage system described by Gongjimu does not seem to solve the problem of high surface drainage water level and low underground drainage water level.

The two share an underground drainage culvert, which means that if a rainstorm comes, the water on the ground will flow down and instantly flood the entire underground city.

At that time, it was not only the disaster of rain, but also all kinds of domestic water, sewage and so on.

The excrement of people in the Tang Dynasty was generally collected by someone and would not be directly discharged into the underground culverts, but even so, domestic water was not necessarily.

The rain is surging, and the underground city is full of sewage, which has also been seen in some old towns that are not rigorous enough in later generations.

Gong Yimu smiled faintly, "Master Hou, look here." ”

He pointed to the hidden place on the drawing, the place he described as the secret door.

"This secret door is used to vent floods."

"In Chang'an, the secret doors are connected with the drainage culverts, and the hidden ditches are located in deep places, and there are secret doors as connections, and the ordinary water volume, the sluice gates are only less than half, and only four are opened."

Eight secret doors, each in the eight directions of the black market, only four open on weekdays.

"If the rain rises and the dungeon is at risk of flooding, open all the secret doors." Gong Zhimu is extremely confident in the design of the secret door, "This secret door is also flawed, and it can easily become a hidden danger. Li Hui understands this, and they all say that people in the black market have strict rules, and those rules are based on iron and blood. Unlike the imperial power on the ground, in the underground world, one person is the king, and he does not need to think about black

What everyone in the city thinks, he just has to think about what is best for him.

With iron-blooded tyranny, there will definitely be people who will escape from the black market, and the secret door will become their escape route.

"Master Hou, above the secret door, there are barbs and iron claws, and there are special guards."

Gong Yimu didn't forget to add, "However, there are also roosters and dog thieves, they are strong in martial arts and are not afraid."

Afraid of barbs and iron claws, pass easily and come and go freely. ”

This is the art of architecture, this is the wisdom of architecture.

Just like ants build their nests and bees build their nests, each creature has its own wisdom in construction.

Human intelligence seems to be more diverse.

"Hehe, Gong Zhimu, if you design it like this, isn't the underground black market a rat hole!"

Looking at the various roads that extend in all directions shown on the drawings, Li Hui suddenly realized.

"Yes, Master Hou, those people are like rats, I just make them more like mice."

"That's why that man had to leave me behind, even if he broke my leg, he couldn't let me go."

Li Hui noticed that on the drawing, from a secret door at the end of Xinghua Fang, there was a faint silk thread, which had not been mentioned by the public transport wood so far, and it looked like a water pipe or something.

"What is this?"

"Master Hou, this is the vent, the same line below the vent, is a deeply buried waterway, which can accommodate a person to drill through, but I still don't know what the person asked me to build this passage for at that time."

Li Hui frowned, could it be an escape channel?

This line seems to be out of place, and it is unusually abrupt on the flat and artistic drawing.

"This passage starts from the end of Xinghuafang, runs through every part of the black market, and is also connected to the culvert, by the way, in the culvert of Chang'an, they seem to have done something tricky."

Li Hui's eyes lit up, this may be the secret of the black market.