King Zheng's ambition is already known to passers-by, as long as anyone who knows a little bit about politics and military affairs knows that it is only a matter of time before Zheng Guo attacks the Wei Guo, and once Zheng Wei starts a war, the weak Wei Guo will lose. The Li State was nearly half larger than the Wei State, and the population was also twice that of the Wei State, but under the iron cavalry of the Zheng State's wolf-headed army, it quickly collapsed in less than a year. Among the five countries of the Central Plains, Zheng Guo's wolf-headed army is already a well-deserved first strong army, and if Hua Guo did not have Hua Wang and Tai Academy, I am afraid that it would not be Zheng Guo's opponent at all.

Xia Yu didn't believe that King Wei could defend the country from the beginning, King Wei was weak and incompetent, when Zheng Guo attacked Li State, there were wise men who built a sage to save King Li Guo, Zheng Guo was powerful, and saving Li Guo was to save Wei Guo. However, the mediocre King Wei did not dare to offend Zheng Guo, so Wei Guo sat idly by, and just watched Li Guo perish little by little. During the year that Zheng Guo attacked Wei Guo, Wei Guo has been immersed in illusory peace, and no one is worried that the fire of war will burn on his head, until the complete collapse of Li Guo, Wei Guo finally realized that the war has been so close that the whole country is panicked.

In this case, Xia Yu had to do something, he didn't care about the survival of the country at all, he just wanted to keep Tongming City, the Xia family, the Bai family and the Li family. However, not a single defender of the country is Zheng Guo's opponent, let alone a small Tongming City? It is impossible for the population of a city to grow much in a short period of time, and the only thing Xia Yu can do now is to hope that the three-dimensional mobile device can make a qualitative leap in the military strength of Tongming City in a short period of time.

However, although Xia Yu hopes that the patriotic army can popularize three-dimensional mobile devices. But this is a very difficult thing for the following reasons: First of all, the first point is the power problem of the three-dimensional motorized device. The power of the three-dimensional motorized device is gas, not to mention whether there is such a thing as gas in this world, and even if there is, it is difficult to achieve large-scale mining with the level of productivity in this world.

Second, it is difficult to achieve mass production of three-dimensional mobile devices, and the production level of this world is not enough to achieve modular production, that is, it cannot be mass-produced. And the inability to mass-produce means that it is impossible to equip the army in large quantities. If only one or two battalions equipped with three-dimensional mobile devices are formed, it will not be able to achieve an overwhelming superiority in a war, and it will be difficult for them to play a role.

The third point is the problem of use, so far only Xia Yu and Meng Siqi have tested the three-dimensional mobile device. Although both of them are very good at handling. But in fact, the two of them cannot be used as a reference index. Because they were both monks, monks were different from ordinary people, even if they didn't use three-dimensional motorized devices. Monks also often fight in the air and are accustomed to the three-dimensional world, but it is still unknown whether ordinary people can get used to it.

These three points, according to Xia Yu's speculation, as long as the third point is trained, there should be no big problem. Whether the second problem can be solved depends on the first problem. The most difficult thing is the first point, in order to solve the power problem, the three-dimensional motorized device must be greatly changed, and the only thing in this world that can be used as power energy is only one, that is, dust crystal.

In the past few days, Xia Yu has been researching how to transplant dust crystals into three-dimensional motorized devices, so that ordinary people can also stimulate the power of dust crystals. At present, the progress of research and development is very slow, more precisely, Xia Yu has not made any progress at all. However, Xia Yu had already thought of a general direction, and if he wanted to combine the dust crystal and the machine, he must need the power of the magic circle, but the current problem was that Xia Yu was not good at the magic circle at all.

"You said to put this three-dimensional motorized device...... Equip the army?!" Meng Siqi looked at Xia Yu in surprise.

"That's right. Xia Yu replied confidently. "Indeed, as you said, in an open field, the three-dimensional motorized device does not have much effect. However, if you are fighting in the forest or in street fighting, the side that can fly freely in the air with a three-dimensional maneuver device will definitely have an overwhelming advantage. I believe that the three-dimensional mobile device will certainly set off a tremendous military revolution in the entire Central Plains continent. Xia Yu looked at Meng Siqi with incomparable firmness in his eyes. "I want to use this device to save the country!"

Meng Siqi looked at Xia Yu's firm cheeks, shocked by what he said, and couldn't help but be surprised to set off a monstrous wave in his heart. As the daughter of the Thunder Emperor, the princess of the Thunder Empire, she has been familiar with military affairs and politics since she was a child, and she can see that if this three-dimensional mobile device can really popularize the army, it will bring great changes to the world, and the combat effectiveness of the patriotic army is likely to complete a qualitative leap overnight, and the name Xia Yu will definitely be accompanied by the prestige of the three-dimensional mobile device, resounding throughout the Central Plains Continent.

However, the prerequisite for this qiē is that Xia Yu can solve the power problem of the three-dimensional motorized device and complete the perfect combination of dust crystals and three-dimensional motorized devices. For this reason, Xia Yu needs to learn the evil mending array.

Although it does not belong to the three major skills of the monk, it plays an extremely important role in the monk's world, and the monk's life almost all the time no longer enjoys the convenience brought by the circle. If you want to enter the Tai Academy from the foot of Beihua Mountain, you need to teleport the circle, the fountain in the square is a water spray circle, the warehouse has a cooling circle to preserve food in the hot summer, and in the winter, the monks will arrange a furnace circle in the house to get warm. The magic circle permeates the bits and pieces of the monk's world, and it can even be said that the magic circle is the cornerstone and leading of the civilization of cultivating immortals, without the magic circle, the behavior of [cultivation] itself cannot be called a civilization at all.

The magic circle can be divided into two types according to the driving method, one is driven by the element force, and the other is driven by dust crystals. The Yuan Force Drive can only be used by monks, relying on the monk's own Yuan Force to activate the magic circle, which is generally more inclined to actual combat. The dust crystal drive completely relies on the power of the dust crystal, even ordinary people can use it, just follow a fixed program, like drawing a triangle or a quadrilateral, draw a circle, and accurately place the dust crystal that provides energy in the circle, then a new circle is successfully completed.

There is no doubt that if the three-dimensional motorized device wants to be popularized in the army that is mostly ordinary people, the only way to choose is the second way, the dust crystal drive. However, Xia Yu didn't know much about the dust crystal drive, so in the next few days, Xia Yu was rooted in the Wanjing Pavilion of the Tai Academy, gnawing books every day, and the preliminary competition of the big competition in the academy was completely participated in by the clone.

After a few days passed, Xia Yu's clone had already fought several battles, and every time he fought, Xia Yu directly stunned the other party with his overlord color domineering, which was simple and effective. And over time, Xia Yu's battle gradually began to attract a large number of disciples to visit, and people were speculating one after another, when would Xia Yu make a move?

On this day, Xia Yu finally met an enemy who was qualified enough for him to make a move, Wu Qing, who was ranked tenth in the last big competition in the hospital. (To be continued......)