Because of the rainy season, a horse-drawn cart pulling a wagon of cement travels very slowly on the muddy road.

By the time the carriage entered the palace, it was already dark, and he was speechless for a while.

This whole day was all delayed on the road, which also strengthened his determination to build the road.

"What the hell are you doing, boy?"

Li Er, who came to hear the news, was stunned when he saw the gray-faced Zhao Yin, and when he saw the unknown items on the carriage, there were ashes floating out, and he couldn't help frowning and asking.

"Cover the cement on the wagon, and don't let water pour on it!"

Ignoring Li Er's inquiry, Zhao Yin directly gave orders to the guards escorting the carriage.

"Yes!"

The guards hurriedly nodded and went about their jobs.

"According to this drawing and scale, start building immediately!"

Zhao Yin handed over the drawings in his hand to the craftsmen who brought them.

"Yes!"

The craftsman took the drawings and handed them over.

"Father-in-law, let's talk about it tomorrow if there is something, and the son-in-law will go back first."

After finishing speaking, Zhao Yin turned around and left, leaving Li Er alone in the wind.

After returning to the Horse Mansion, as expected, it was another night of hard work, but fortunately, Princess Changle had left him enough face in the recent period to delay the next day.

This made Zhao Yin have to leave the matter of exchanging the enhancer behind, as long as she didn't be ruthless, she would be able to deal with it.

At the same time, it also made him extremely depressed, he had the peerless strength of his own, but his physical strength was not as good as that girl, which couldn't help but make him extremely depressed.

"What are the arrangements for today, colt?"

Since being reprimanded by the queen mother, Princess Changle has been very planned every night, but it is precisely because of this that she is now very concerned about his daily whereabouts.

"Go to the palace and show my father-in-law the results of my research."

With her in the Horse Mansion, he didn't want the Wu sisters to come over to wait, so he could only put on his own clothes, and she would sort them out herself.

"I'll go with you!"

Princess Changle's words were full of undoubtedness, and at the same time, she was also curious about what her man was studying these days, and he was dirty.

"Good!"

Zhao Yin was very helpless, and he didn't know why he didn't reassure her so much, she was about to become a plaster.

……

"You kid is here, let's wait!"

As soon as he and Princess Changle came to the Imperial Garden, Zhao Yin saw the eldest grandson Wuji with a smile on his face.

"What are you doing here? Why are they all gathered here? ”

Zhao Yin looked at the ministers with a confused expression, tilted his head, and asked suspiciously.

I'm just building a toilet in the Imperial Garden, so many people come to watch?

"It's not like the big guy heard that you have a way to solve the troubles of the rainy day, so the big guy is waiting for you here!"

Lu Guogong walked over with a black line on his face.

It's been a few days since the bet, but how could this kid be so uninteresting, and he hasn't said to visit him once.

Could it be that this kid is still waiting for Lao Tzu and personally tied up his daughter and sent her to the Horse Mansion?

"What should I be?"

Zhao Yin's face was full of black lines, and he was speechless.

"Nephew, what is this?"

Cheng Yanjin looked at the unknown building at the corner of the Imperial Garden, and asked suspiciously.

"What the hell are you going to build? Why is it so weird? ”

Li Er also frowned and asked.

The building looks like a house, but it's a little too small, is it just to make an experiment for me?

"It's a public toilet!"

Zhao Yin replied with a smile.

"Public toilets?"

Everyone was puzzled, this is a new term, they have heard of the latrine, but what is the purpose of the public toilet?

"Yes, let's go over and have a look, and you'll understand!"

Zhao Yin sold a pass and walked towards the public toilet with Li Er.

"You kid built a latrine in my imperial garden?"

But after getting closer, Li Er's face changed, and he asked angrily.

If he still couldn't understand what it was, he would have lived for so many years in vain.

The other civil and military officials also looked at this scene with strange expressions, and secretly said in their hearts that this kid really dares to do anything.

"Yes, there are a lot of people coming and going in the Imperial Garden, if there is this public toilet, won't it be convenient for everyone in the future......?"

Zhao Yin looked at Li Er with a smile, "Father-in-law, do you want to feel it?" ”

Although the appearance is very unsightly, these are secondary and can be modified later.

"Someone! Why don't you dismantle this thing to me! ”

Li Er, with a dark face, gave an order to the Qianniu Wei beside him.

This bastard, this is his imperial garden, and if you get such a thing here, it's a big sight.

He regrets dying now, how could he have believed this kid's nonsense in the first place, but now it's good, he has become the joke of the entire Tang Dynasty.

"Bang! Bang! ”

The guards did not dare to disobey His Majesty's will, and hurried over and began to disassemble by brute force, and from time to time there was a muffled sound.

However, the newly built thatched hut remained untouched.

"Don't you know how to use tools?"

After seeing this scene, Li Er's face turned even darker, and he roared angrily.

Many of the guards secretly glanced at the horse, and found that his expression had not changed, so they relieved themselves, hurriedly went to the side to get wood, and used siege means to hit the wall of the hut.

"Boom! Rumble! ”

The dull sound continued to hit everyone's eardrums, but only a small amount of dirt fell from the wall, and the overall wall did not change.

This scene couldn't help but make the eyes of the soldiers brighten.

This wall was made of a little more special earth, but it was so tough, wouldn't it be even stronger if it were used to build a wall?

"Your Majesty, how tenacious do you think this thing is?"

Zhao Yin asked Li Er, who was dark-faced, with a slight arch of his hand.

"Do you really think I can't help it?"

Li Er's face turned green, he didn't expect that this thing would be so strong, but the appearance of such an abrupt thing in the imperial garden really made him extremely unhappy.

"Your Majesty, you may have misunderstood, I think what the horse wants to express is that if this technology is widely used in building cities, then my Datang country will be more solid and inviolable."

The eldest grandson Wuji hurriedly opened his mouth.

He thought he understood the horse's intentions, and with a clear expression, he kept stroking his beard.

"The minister seconded the proposal!"

The other ministers also hurriedly gave up their hands, and with the solidity of this thing, it is presumable that a lot of silver taels will be saved every year to repair the city.