The small section of the wall, which was made of imitation of the city wall, had only a few pieces of cement falling off on it, but the stones did not loosen at all, and were still tightly bonded together by the cement.

Li Yu opened his mouth, but did not speak.

I just raised my hand and touched the city wall, touching it again and again, my expression was full of surprise and surprise.

"Wei Xiannan, how is this cement made?" Li Yu asked.

"Your Highness, rest assured, now only Weichen and the old kiln head under Weichen know the real match." Wei Renshi said: "No one else can make cement. ”

Li Yu nodded, sighed, and said in a low voice, "Father will regret not being able to come and see it with his own eyes today." ”

After saying that, he looked solemn again, and said: "Wei Xiannan, this thing of cement must be of great use, and you should be a great merit to offer this thing." However, this practice must be kept absolutely secret, and no one else should know about it. ”

"Your Highness, don't worry, this micro-minister can save it." Wei Renshi nodded and said.

"If all the cities of my Tang Dynasty are built in this way, with other countries, where can there be any way to shake this kind of wall? If all the official roads in my Datang are built with cement like this, then the horses will travel on them, and the speed is much faster than now, if all the roads in my Datang are like this, then I will send to the soldiers at night, and the food for disaster relief can also shorten the journey, and there will be ......a lot less wear and tear, and there will be more food in the hands of the refugees in the disaster area," Li Yu muttered to himself.

Li Yu didn't know what he was trying to write, and stood there alone in contemplation.

The ministers he had brought with him were looking at the concrete demonstrations, and they were very curious.

"Renshi, what a god!" Li Chun was also shocked by the situation just demonstrated, he walked to Wei Renshi's side and said.

It's convenient again!

Wei Renshi smiled secretly in his heart and said, "The role of cement is far greater than today's demonstration. If you use this to repair the embankment, the embankment will inevitably be much stronger, and you won't have to repair it every year in the future, how much money will be saved by this? ”

"Wei Renshi, Wei Renshi, how did you make such a thing?" Li Chun sighed: "These things, others are afraid that they can't even think of it, how do you know that there is such a thing, and you will know how to do it?" ”

Wei Renshi smiled mysteriously and said, "Prince Chun is interested?" Hehe, we can communicate more in the future. I'll have a lot of stuff to do, and that's just scratching the surface. ”

Li Chun looked at Wei Renshi in a daze, saw Wei Renshi's full of confidence, and heard Wei Renshi say: "The world doesn't know many principles, but I know that I will definitely make this Datang better." ”

Li Chun was stunned again, but when he saw that Wei Renshi had already left, he went to Li Yan's side and said: "Your Royal Highness the Prince, all the ministers have also seen this today, and I think all the officials know the severity, but I still ask Your Highness to say it again, it is more secure." ”

Li Yu nodded, and instructed those ministers in the past that what they saw today should never be mentioned to anyone.

The crowd hurriedly saluted.

Li Yu looked at Wei Renshi again, and said with a smile: "Wei County Man has made a great contribution this time, Gu will definitely go back to report to his father, and reward Wei County Man for his life." ”

Wei Renshi thought for a while and said, "Then can you ask Your Highness to ask for a reward for Wei Chen?" ”

"Oh?" Li Yu asked unexpectedly, "What reward does Wei Xiannan want?" ”

"Weichen wants to build a cement road between Weinan and Chang'an at his own expense!" Wei Renshi said in a deep voice.

"What?!" Li Yu was stunned: "Why?!" ”

Wei Renshi bowed and replied, "Your Majesty's fief for Weichen is in Weinan, where the people are diligent in farming and treat people warmly. Since Weichen was enshrined in Weinan, he also hopes that the life of the people of Weinan will be better and better. But Weichen is not a Weinan County order, so if some things are done directly by Weichen, it is overstepping his authority, and it is not beautiful in the end. Therefore, Weichen hopes to be able to fund his own funds to build a cement road from Chang'an City to Weinan. Weinan is already close to Chang'an City, if there is a cement road in the middle, then from Chang'an to Weinan, or from Weinan to Chang'an, the time spent on the road will be greatly reduced. Usually set off in the morning, the ordinary speed of horseback riding, and when you arrive in Weinan from Chang'an, it is often in the afternoon. If the cement road is built, then from Chang'an to Weinan, the ordinary speed only takes a few hours to arrive, if the horse is fast, then an hour, or even less than an hour can be reached. ”

"Oh, it turns out that this road was built to make it easier for Wei Xianmen to go back and forth between Chang'an and Weinan!" Li Chun looked at Wei Renshi and said in surprise.

Wei Renshi shook his head and said, "Of course, building a cement road between Chang'an and Weinan can indeed make it much more convenient for Weichen. However, the purpose of Weichen to build this cement road is not to make it convenient for Weichen, but to make Weinan and the people of Weinan become richer. ”

"Oh? The lonely man wants to hear it. Li Yu smiled and said, "How can Wei County and the people of Weinan become rich just by building a road. ”

Wei Renshi smiled and opened his mouth to spit out six words: "If you want to get rich, build roads first." ”

"If you want to get rich, build roads first?" Li Yu groaned again, and then looked up at Wei Renshi again: "Wei Xiannan, what does this sentence mean?" ”

"Back to Your Highness, if you want to get rich, build roads first. This sentence here is about the relationship between transportation and wealth. Wei Renshi explained to Li Yu and Li Chun: "The most obvious example is Yangzhou. Does Your Highness know what Yangzhou looked like before the Grand Canal was built? Since the completion of the Grand Canal, Yangzhou has become a transportation hub connecting the north and the south. The transportation of a place determines the degree to which local resources are converted into wealth. With good transportation conditions, a place will have more communication with the outside world, whether it is people or things. Local resources can be quickly transported to other places through good transportation conditions and transformed into wealth. Take Yangzhou as an example, after the completion of the Grand Canal, if the goods in the south of the Yangtze River want to be sold to the north, they must first go to Yangzhou, and then board the ship to the north. Yangzhou has become a place for the distribution of goods from all over the south of the Yangtze River, with a large flow of people, these people have to eat and stay, which makes the business of the local people better, and Yangzhou is naturally prosperous. Like Chang'an, Luoyang, Jinyang, Yangzhou and so on, which of these prosperous places is not because there are roads that can be accessed from all directions? Weichen gave His Royal Highness an analogy, just like Weinan and Lantian, both of which are Gyeonggi land near Chang'an. The distance between the two and Chang'an is also close. Now if both places are rich in coal mines, and now that winter is coming, Weichen wants to buy coal to make honeycomb coal, and he has to choose one from Weinan and Lantian to buy coal. If it were His Royal Highness, where would he choose to buy it from? ”