Time flows out like sand at your fingertips. Winter goes to spring, when the light rain of Qingming is dripping. People are starting to get rid of their bloated winter clothes and prepare for the new spring.

Li Yuan put down the red pen in his hand, and the Tang Dynasty entered the martial arts for three years. Whether it is the use of troops abroad or internal affairs, it is a new level every year. Li Jiancheng sorted out internal affairs quite in a disciplined manner, and Li Shimin was invincible in foreign campaigns. Li Yuan is very proud of his two sons, and he has gradually become a great Tang dynasty with one article and one martial arts. Whether it is Wang Shichong or Dou Jiande, they are just princes in a corner of peace. Sooner or later, it will be exterminated by the Li family's army.

After reviewing the recital for a day, Li Yuan felt a sore back. The little chamberlain opened the door of the palace, and the sunshine shone in from the west, reflecting the glass eagle on the desk into gold. The glass eagle is like a big peng spreading its wings, as if it can come back to life at any time.

"What is Yun Hao doing?" Li Yuan saw the glass eagle on the table, and suddenly remembered Yun Hao. On the first day, Yun Hao brought his fat son who had just left to pay New Year's greetings to himself. The chubby cloud baby, shaving Afu's head, and the chubby Dundun's doll is festive. Holding a brocade box in both hands, it contained this glass eagle.

Li Yuan liked this glass eagle very much, and specially placed this object on the dragon book case, symbolizing that the Tang Empire was like an eagle soaring to the sky.

The sensitive Li Yuan felt that Yun Hao was hiding from something, since he came back from the Shanxi front. Yun Hao has been hiding in his Lintong fiefdom, and he will definitely not take a step out of the fief except for Yuan Ri. There are already officials who have privately discussed that Yun Hao's behavior is sneaky and fearful of doing unsubordinated things. Several newly-promoted speech officials are eager to try and prepare to practice with this little and small marquis.

Li Shentong is Li Yuan's hardcore brother, so Li Shentong informed the matter. Li Yuan naturally also knew about the battle between his two sons. Li Yuan didn't take it to heart, the crown prince was the heir to the throne of the prince. The title has been decided, no matter how much merit Li Er encounters, he will be the most honorable prince of the Tang Dynasty. For the replacement of the crown prince, this idea never appeared in Li Yuan's head.

Li Yuan confidently believed that he could settle the dispute between his sons. He would even give Li Er some encouragement and let Li Er launch some attacks on the crown prince's position. In order to experience Li Jiancheng, so that he can withstand greater tests in the future wind and rain. Regarding Yun Hao's evasion, Li Yuan thought that it was persecution paranoia caused by too much thought.

"Yunhou set up a academy in Lintong and recruited some children of Xu officials." Su Jin is Li Yuan's Baidu search, as long as Li Yuan asks a question, he must give an answer in the first time. I don't know what kind of database his brain is.

"Oh, that's weird. Why don't you recruit some noble children? Li Yuan was a little puzzled, Yun Hao was the smartest child in Datang. There is a consensus among all the nobles on this point, he recruited disciples, and the nobles should dig the door and steal the hole and drill into it, why did he only recruit some of the sons of the officials?

"Back to Your Majesty's words! The college of Yunhou is called the College of Engineering, and it teaches some of the skills of forging iron and other skills. The officials wanted to give the concubines in their families a craft to make a living, so they would naturally send those concubines there. And the children of the nobles are unwilling to learn those crafts. ”

Oh, that's it. If you ask Guogong's son to be a carpenter or a blacksmith, he will definitely fight with Yun Hao with a horizontal knife.

"Construction is also a major matter of the country, and the soldiers must have strong armor and sharp blades. The state needed strong walls, horse-drawn carriages that facilitated transportation. In these aspects, Yun Hao has some skills. Cement is a good thing, Xiaogong in Jiangnan did not forget to write to this thing, saying that it is very useful to build a city. Li Yuan's eyes looked at the outside of the main hall, as if he had been going to see Jiangnan. His most capable nephew is fighting for Datang there.

The sun is three poles up, and the spring sun shines on the body. At the foot of Lishan Mountain, rows of new houses have been built, which are different from all the houses in Datang. The four-storey building is made of brick and stone. Except for the doors and windows, they are all masonry. Don't be afraid of those abominable termites anymore, many wooden buildings in Guanzhong have been destroyed by those little insects. In the words of the old fisherman, even if the earth dragon turns over, there will be no problems with this building.

The huge gatehouse is also made of bricks and stones, and the four vigorous and powerful characters on it were specially inscribed by Yun Hao to Mr. Yan Liben. If it is a later generation, just selling these four words can build two teaching buildings.

The college had no walls, but small elm trees three feet high were planted against the edge of the house. Yun Hao said that it was summer. Just prune these elms into a boxy shape, and they don't play much like a wall.

Spring is back in the green, and gardeners are planting soft weeds on the playground. Students usually walk along the gravel-paved road to and from school.

"Today we will talk about the power of pulleys, and now I will show you how powerful the power of machinery is, with this thing we will be able to conquer the whole world." Through a set of pulleys, Yun Hao easily used a rope to pull up hundreds of catties of boulders. Then, with the help of the servants, turn the iron frame to lower the boulder high.

Li Yuan gasped, he naturally thought of the military use of this kind of thing. With this thing, hundreds of pounds of boulders can be easily sent to the city wall. If this thing were thrown off the city walls, it is estimated that the iron siege engines would have to be smashed flat.

"The high-rise buildings we built were built brick by brick with this kind of thing." Yun Hao pointed to the tall four-story teaching building and said proudly.

"Hey, how does the old man walk on the grass. The grass has just been laid out and hasn't grown yet, so get out of here! "Suddenly the guards dressed in black and carrying wooden sticks rushed like hounds.

As soon as Su Jin turned around, he stood in front of Li Yuan, his hungry wolf-like eyes staring at the guard. Li Yuan pulled Su Jin away with a smile and said to the guard: "The old man doesn't know, and those who don't know are not to blame!" Hehe! ”

"Seeing that you are also a scholar, the pasture has not been built yet, so don't trample on it for the time being. Once the grass has taken root, then no problem. Seeing that Li Yuan had a good attitude, the guards didn't stay in trouble, but just glared at Su Jin viciously. was so angry that Su Jin wanted to stuff the stick out of his mouth.

Li Yuan walked to the cement pavement slab and couldn't help but shake his head when he looked at the exquisite patterns. How much manpower and material resources do it take, and Yun Hao's luxury problem can't be changed.

"See Your Majesty!" Hearing the guard's scolding, Yun Hao had already discovered Li Yuan and his party. hurriedly left the student, trotted in front of Li Yuan, and bowed to the ground.

"Poof"! The guards who scolded Li Yuan, when they heard that they had just scolded the emperor, were so frightened that they fainted with a "bang".

PS: Thank you for the AAMM6733's tip, I didn't say it today!