Otaku Engineer in Great Tang Dynasty

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"Xiang Gong~! Has something happened again these days? My concubine has been frowning when I saw you several times~!"

That night.

The West Courtyard of Li Mansion.

While helping Li Zexuan undress, Han Yuxi asked softly from behind.

"Well, it's something to do~! Madam, do you still remember the assassin in the east of Chang'an a few days ago~?"

Li Zexuan nodded and said.

Husband and wife are one body, and the Seventh Cultivation Sect is not a very powerful force in Li Zexuan's eyes, so he feels that there is no need to hide it from his daughter-in-law.

Han Yuxi's hand holding the clothes shook violently, she saw her brows furrowed, and her voice suddenly became cold, and replied:

"Of course I remember~! That person injured my husband, and if my concubine has the ability, she will be smashed into tens of thousands of pieces~!"

Li Zexuan laughed, turned around and took Han Yuxi into his arms, saying:

"Haha~! It's up to men to do all the fighting~! Madam, you can eat, drink, rest, and rest~!"

Han Yuxi said angrily, "Eat, drink and rest well, isn't that a pig~?"

"Haha~! What happened to the pig~? The pig is still the second smartest little animal in the world~!"

"Go~! Don't be poor, let's get down to business~! What did you mean by that assassin~? Did you meet him again these days~?"

Han Yuxi gave Li Zexuan a blank look, and then asked seriously.

"Hmm~! That's not~!"

Li Zexuan took Han Yuxi to lie on the bed together, and then continued: "Yesterday I accidentally heard the origin of the assassin from Wang Renbiao's house, it is said to be from the Seventh Cultivation Sect of Snake Spirit Mountain, and then I went to Jingzhao Mansion to entrust Washington Mansion. Yin helped me find out the exact location of Snake Spirit Mountain~! I'm sure there will be results in a few days~!"

"Snake Spirit Mountain~?"

Han Yuxi murmured, but after all, she still felt that she had never heard of it, so she continued: "I hope Jingzhao House can bring this assassin to justice, otherwise my concubine's heart will always be unstable~!"

Although Li Zexuan knew in his heart that this matter would not be solved so easily, he still said comfortably: "Yes, yes~! This time I can definitely catch the assassin~! Madam~, let's rest early~! "

"Hmm~!"

......................................

"Hmm~? This cement is really interesting~!"

In the hall of nectar, candles are still lit in the middle of the night.

Li Er played with a palm-sized cement block on the dragon case and smiled meaningfully.

Sitting next to him is Empress Changsun.

The couple didn't sleep in the Lizheng Palace in the middle of the night, but they went to the Ganlu Palace to work, and they didn't know what they were thinking.

"Your Majesty, is this what Qing Que brought back today~?"

Queen Changsun asked curiously.

"Hehe~! Exactly~! It is said that this is a new material specially developed by Li Zexuan to ask Qiquge Workshop to replace glutinous rice mortar. Now it seems that the effect is surprisingly good~!"

Li Erhe sighed and then handed a large piece of cement to Empress Zhangsun.

In other words, I don't know where Li Tai brought this product from a piece of cement pavement that was broken at the construction site. It is estimated that a certain craftsman will be scolded again tomorrow!

"Wow~! It's so strong~! Your Majesty, is this large piece made of cement~?"

Empress Changsun took it over and squeezed it with her hand. She was taken aback and asked hurriedly.

"Well, that's true! The setting ability of this cement is better than that of glutinous rice mortar! Li Zexuan has brought a more practical and cheaper new thing to my Tang Dynasty!"

Li Er sighed.

"Huh~? Why did Your Majesty know that this cement is cheaper than glutinous rice mortar~?"

Queen Changsun asked curiously.

"Oh~! Needless to say~? You can guess it. If this thing is more expensive than glutinous rice mortar, why would Li Zexuan bother to study it~? I estimate that the ingredients in this cement should be some sand and lime. That's it, it doesn't contain any expensive raw materials!"

If Li Zexuan were here, he would definitely give Li Er a wave of "6666666". Old Li's initial guess would be so unacceptable!

"Well~! So, if this cement appeared ten years earlier, wouldn't the city wall of Chang'an City save a lot of money? Besides, if the city wall is built with cement, it should be stronger, right?"

Empress Changsun said regretfully.

The predecessor of Chang’an, the capital of the Tang Dynasty, was Daxing City built under the auspices of Yu Wenkai in the early Sui Dynasty. It is recorded in the “Yuanhe County Map Zhi”: “The Sui family’s camp capital, Yuwenkai used the six high slopes in the north and south of Zhuque Street as the center of Qian Gua. Elephant, therefore, ninety-two palaces are set up to serve as the residence of emperors, ninety-three to establish a hundred officials, to respond to the number of gentlemen, ninety-five nobles, and I don’t want ordinary people to live in them, so Xuandu Temple and Xingshan Temple are built to guard them. ." It means to design the overall layout of the capital with reference to the Zhouyi Xiangshu theory and the Qianfu Liuyao.

In the first year of Wude, when the Tang Dynasty was established, Li Yuan ordered Yan Lide to rebuild the outer Guocheng of Chang'an City.

The mileage in the Tang Dynasty was 360 steps for a large distance and 300 steps for a small distance; 12 inches for large feet and 10 inches for small feet. After the Chang'an City at that time was calculated by converting large distances and large feet, the length of the outer Guo city wall was calculated. The total length has reached about 36 kilometers. At that time, it was undoubtedly a magnificent project unparalleled in the world. Of course, the money wasted also

is an astronomical number.

Therefore, Empress Changsun will feel a little regret after seeing the cement.

Since the "Wei Shui Alliance" last year, Li Er has been worrying about money, and Queen Changsun will naturally be particularly sensitive and concerned about saving money.

"Haha~! This is the end of the story, it's useless to talk about it~! What's more, no matter how strong the city wall is when it encounters a real strong enemy, it will be useless! The soldiers of my Tang Dynasty are the most solid city walls of my Tang Dynasty~! The descendants of future generations are not up to their expectations, and they are forced to retreat within the city walls by foreign soldiers. Then I think it is better to subjugate the country~! The Great Tang, I must submit to the four barbarians, and all nations are afraid~! No one will be able to invade Chang'an again. It's a city~!"

Speaking of the city wall, Li Er suddenly remembered that last year, the two khans of Jieli and Tuli led 200,000 Turkic soldiers to line up the Wei River and approach the city of Chang'an. That time, if Jie Li was a little more brave and attacked Chang'an City regardless, even if the city walls of Chang'an City were as tall and majestic, they would not be able to withstand the attack of these 200,000 soldiers. In my opinion, it is better to defend than to attack!

This is the difference between Li Er and later kings! If Li Zexuan traveled to the middle and late Song Dynasty or Ming Dynasty, if he made another cement, there is a 90% probability that the monarch at that time would use the cement to reinforce the city wall and defend against foreign enemies. They are "upgrading their armor" to ensure survival, and what Li Er pursues is to replace defense with offense. When all the enemies are terrified, naturally there is no need for a city wall to defend against foreign enemies!

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