If there is no request from Lu Dongzan, I am afraid that when the Tang Dynasty officially rules the plateau, it will not let go of this building. Just like when the Gaochang Palace was burned, a second building symbolizing royal power was absolutely not allowed to exist in the territory of the Tang Dynasty.

It's good to leave a building that represents history, so Leng Feng happily agreed to Lu Dongzan's request.

When Leng Feng agreed, Lu Dongzan lost his backbone in an instant.

In the past, he hoped to obtain the technology of the Tang Dynasty in order to make Tubo strong, but now, he has received technical support, but it can only be used to improve people's livelihood.

However, the army that Tubo left had already gained a foothold in Tianzhu, and Xiao Zampu's assistance was also handed over to his son's second son, Qin. Despite leaving the ancestral land, the strength of Tibet can be expected.

Without disturbing Lu Dongzan to think about things, Leng Feng stood up and left.

The morning was spent catching birds, and the afternoon time was going to see Li Tai.

Since arriving in Lingnan, Li Tai has only been playing for a few days, and then he has plunged headlong into the laboratory he had left in Lingnan, which is said to be researching oil engines.

Leng Feng's sentence "direct combustion of gasoline can also bring power" gave Li Tai a lot of inspiration. If the engine could be worked out, then the plane would be able to fly higher and farther, and the train would not have to breathe thick soot.

In order to devote himself to the study of the engine, Li Tai even did not hesitate to push the research of the battery to the researchers in Chang'an.

The laboratory is heavily guarded, and no one is allowed to enter, and the leader of the troops is Wuli Sima of the South China Sea Fleet, Feng Zhidai is very smart and doesn't ask anything about things here.

As soon as he passed through the blockade circle, Leng Feng heard a loud explosion.

"Green Sparrow!"

No one knows better than Leng Feng what this explosion represents, most likely Li Tai found the right way and the engine exploded.

Smoke had risen from the lab, and there was still a faint glow of fire. But by the time Leng Feng got closer, the soldiers had already disposed of all the flames with sand. Li Tai walked out with a dark face, still panicked.

Seeing that Li Tai was fine, Leng Feng relieved himself. Although an engine explosion is not as good as gunpowder, it can still threaten human life.

"Master, I anticipated the danger, so the preparation for protection was sufficient, but the engine I finally assembled was scrapped."

Seeing Li Tai's decadent appearance, Leng Feng did not persuade him.

For so many years, Li Tai has been tortured by all kinds of failures, and what he needs at this time is catharsis, not comfort. On his own, he was able to adjust his mentality.

"Qingque, since it's blown up, make another one, it's no big deal. Since this fails, you take a few days off and go fishing with your nephew to relax. ”

Li Tai wiped his face clean and nodded: "I seem to have grasped the principle of the internal combustion engine a little, but it's a pity that the craftsmen here in Lingnan are not good, and there are always cracks in the iron shell caused by it, otherwise I should be able to experiment with some results, instead of exploding directly." Master, when are we going to return to Chang'an? ”

For better experiments, Li Tai really wanted to return to Chang'an, and only the laboratory he had exclusive to him could have what he wanted.

Looking at Li Tai's expectant look, Leng Feng could only say: "In a few days, when Lu Dongzan is sent away, we will leave for Chang'an." This time, let's take the sea route, walk along the coast of Datang, and when we arrive in Dengzhou, we will go back to Chang'an directly, without stopping halfway. ”

It is hard to imagine what Li Tai will look like after he studies the internal combustion engine, in Leng Feng's view, now that there is a steam engine, the industrial level is already very good.

However, if Li Tai's internal combustion engine research is successful, and the battery of the scientific research institute can also be studied, then Datang will officially enter the electric age. In the original history, these two eras were separated by a hundred years, but in today's Tang Dynasty, how long has it been apart?

Of course, if you compare the two histories, you will find that the appearance of the cold front is very abrupt, and there is a person who can put industrial development back on track at any time, and there will be many detours. However, it is the number of people who determines the speed of development. Regardless of other places for the time being, there are nearly 2,000 people in the scientific research institute alone, and these 2,000 people do not need to support their families at all, as long as they devote themselves to their own work.

With so many people stumbling together, there will always be someone who hits the right result.

Quantitative change is the most direct cause of qualitative change.

After praising Lu Dong out of the Lingnan territory, Leng Feng took his tour group and started to return.

When I came, I took the inland waterway, and when I returned, I walked along the coast.

Although there are already many people in Datang, it is still impossible to occupy the mountains and rivers. On the coastline, only Mingzhou, Zhangzhou and other places have harbors, which have driven the prosperity of the surrounding areas, and the rest are more flood areas.

The result is caused by the vast land of Datang. After successively accommodating the western regions of the grassland, there is no need to worry about land distribution, and now the officials are worried about the shelving of land. It is precisely because the land is so vast that no one has turned their attention to the ocean.

Now the territory of the Tang Dynasty is vast and can be said to be unprecedented, and the emperors within three or four generations may not need to launch land wars.

When passing through the estuary of the Yangtze River, Leng Feng deliberately glanced at the coastline.

Originally, this was supposed to be a prosperous city, but now it is still a desolate place, and the grass on the shore is taller than people.

Although it was a hurry, the tour group still did not give up the purpose of coming out this time, and when passing by famous places, they would stop and rest for a while. When approaching Mount Tai, Leng Feng also deliberately took Li Jiyuan to climb Mount Tai together.

Li Jiyuan's physical strength was limited, and he only climbed half of the climb on the first day, and everyone had to set up a tent halfway up the mountain and spend the night here.

The next day, when the sun rose, Li Jiyuan looked at the much smaller buildings under the mountain, and couldn't help but sigh with emotion: "Such a high mountain, no wonder people have admired it since ancient times, and the emperor wanted to enshrine Zen here." ”

Leng Feng smiled: "Feng Zen is a form, but it is actually useless. If it weren't for the purpose of suppressing the wealthy families in Shandong and reducing the swelling of Xun Guiqun, your imperial grandfather would not have stubbornly come over to seal Zen. The emperors in history who sealed Zen did not go down in history because they sealed Zen. ”

Li Jiyuan nodded, feeling that what Shigong said was very reasonable. For example, my father had no interest in Feng Chan, and always said that the suppression of local wealthy families was enough, and now this pattern is just right.

Li Jiyuan doesn't know those complicated relationships, he only knows that the current imperial court has been perfected after the rectification of the emperor's grandfather and father, and as long as he follows the vein of his predecessors, he will not make mistakes.