Dai Huadong drew a three-dimensional diagram and three views of the steel rails on the blackboard, then turned to the students and teachers sitting there and said, "If you want to get rich, build roads first." These are the railroad tracks, on which the train itself was designed. It's designed to connect cities, so it will require a lot of rails, and more importantly, you can't make rails that meet the standards quickly and in large quantities with the blacksmith's current method! So your processing methods need to be reformed! Dai Huadong said, slamming the podium, "Tell me, what are your ways to improve?" ”

The students and teachers all began to stare at the railroad tracks drawn on the blackboard and began to think as hard as they could.

Fan Yu looked at the railroad tracks, a little disappointed, especially after hearing Dai Huadong say that this was the track that was necessary for any train. In his eyes, although those ordinary iron ore mines are not particularly valuable, Dai Huadong actually said that he wanted to connect the city, so that the accumulation of iron ore alone would cost a huge amount of money, not to mention the labor costs required, this kind of thing is completely a loser's behavior.

If Dai Huadong knew Fan Yu's thoughts, he could only say that the information he had was different, so the generation gap arose. Railways like the one that connect several cities would have to rely on state investment, and the longer it is built, the easier it will be to pay for itself. But Fan Yu didn't know the data of the train at all, so he naturally couldn't understand it.

"Wait a minute, you said this is going to be connected to other cities, have you considered the cost? Although I haven't calculated it carefully, I'm sure that the cost is astronomical, just to build the tracks of that train? Fan Yu thought of it and asked.

Dai Huadong was stunned for a moment, he didn't seem to have seen this teacher yesterday, so he also asked, "Who are you?" ”

As soon as Fan Yu wanted to speak, those teachers noticed him and exclaimed, "Isn't that Fan Yu teacher?" Why did he come too? ”

"Fan Yu-sensei? Are you Yu Hao's teacher? Dai Huadong glanced at Huo Yuhao next to him, and saw Huo Yuhao nodding at him, and his heart suddenly understood.

So Dai Huadong glanced at the students and teachers in this classroom, then looked at Fan Yu, and said, "Since Teacher Fan Yu raised this point, I will explain it to you, first of all, I will draw a simple picture for you." ”

Dai Huadong drew a sketch of a locomotive on the blackboard, and said: "This is the locomotive, the most important part of the whole train, the power of the whole train is provided by it, and then the locomotive is connected to the carriages with different functions, you can transport different things, such as an ordinary iron box, you can use it to transport those materials, such as minerals, commodities, grain, etc." If you add a fixed seat to the carriage, then you can take someone with you. Then, it was so powerful that it could carry no certainty, but it was certain that it could carry at least a hundred wagons that could pull it, and that it could get it to where the rails could be laid in a very short time. Moreover, it is not soul power that is used. Do you see the meaning behind it? ”

Fan Yu was stunned for a moment, he felt something, but he still didn't catch it, but he found an obvious loophole in Dai Huadong's words.

"You say that its power is not soul power, so what kind of power can reach the level you say? Don't tell me it's manpower. Fan Yu said.

Dai Huadong smiled and said: "Of course it's not human power, human beings themselves are very weak, so they need to rely on external forces." ”

Then he turned to the students and said, "Everyone knows that water turns into gas when it boils, right?" ”

Those students didn't understand why Dai Huadong mentioned this, but they still nodded.

"So does anyone know how much more water gets when it turns into water vapor?" Dai Huadong continued to ask.

Everyone was stunned, they didn't know how many there were, and they hadn't tested it.

"Looks like no one knows? Xu Yiyi, you should know, right? Dai Huadong looked at Xu Yiyi who was sitting next to him.

Xu Yiyi stood up in a panic, a little stage frightened, but still said: "At least a thousand times." ”

Fan Yu frowned: "Does this have anything to do with the motivation you said?" ”

"Of course, what do you think would happen if you put a quarter of water in a metal cylinder, and you left only one opening, and then you plug that opening with a wooden stopper, and then heat that metal cylinder?" Dai Huadong looked at Fan Yu with a smile on his face.

"That cork will be washed away...... "Fan Yu suddenly understood, "You want to use this as motivation?" ”

"That's right, that's the power source of the train, using coal to boil water, so that it is evaporated into water vapor, and then it is introduced into a tube, and a piston is added to the pipe, and the water vapor is pushed into the piston, and then a certain distance is added to the vent, so that the water vapor can come out of there, and at the same time, a certain mechanical structure is used to make that piston return to its original position, and the ventilation hole is blocked, and in this way, we can convert it into power. Fan Yu, are you satisfied with my explanation? Dai Huadong said.

"This ......" Fan Yu slapped the table, "You little guy didn't come to the soul guide system, it's a loss to the soul guide system!" Come on, what's that piston? ”

“…… Fan Yu, I'll talk about this later, we're now discussing how to make enough rails efficiently, because we're all far from explaining your problem. ”

"What is the train, wasting time, money and manpower, it is simply more than worth the loss, the point is the new motivation you have discovered! You don't need soul power, so even ordinary people can use it! "Fan Yu has a little hatred that iron is not steel, what is the use of this thing, wasting so much money, you can only go back and forth on a limited track, it is not very useful.

"Mr. Fan Yu, although steam power is indeed an emerging power, I don't think that trains are worth the loss." Dai Huadong said with a serious face, "If you think about it carefully, this is a strategic-level invention." ”

Fan Yu was stunned for a moment, then thought of something, and suddenly showed a shocked expression.

"In short, back to the topic, how to improve the efficiency of forging? Quickly build enough rails? Dai Huadong turned to the students.

"That...... Ask a high-level soul master to help? One of the students said uncertainly.

Dai Huadong shook his head and said, "First of all, let's not talk about whether a high-level soul master is willing to do this kind of thing, isn't it too wasteful for you to use a high-level soul master to make such a simple thing." And I'm talking about reforming the forging process, not making up the numbers with high-level soul masters. Dai Huadong said.

"But today's forging method has been passed down for 10,000 years, which means that it is very perfect, how difficult is it to improve?" A teacher said, "There must have been many ancestors who have thought about improving it for thousands of years, but it is still the case today, which shows that it is difficult to improve the forging method, and the best forging technique is only the chaotic cloak hammer method that is only available within the Tang Sect, but we don't know it at all." ”

Dai Huadong held his forehead, then slammed the table and said loudly: "Tell me!" What is a Soul Guide? ”

"The soul guide is the weapon that the soul master urges with soul power, this should be the basic knowledge." Fan Yu said.

"Wrong! Miss by a mile! Dai Huadong ruthlessly vetoed his words, "The soul guide is a tool!" What is the definition of a tool? A device that compensates for the shortcomings of human beings and makes it easier for human beings to live! Because the aggression of the auxiliary soul master is insufficient, there will be an offensive soul guide, because the night is too dark to see things clearly, so there will be a candle for lighting, because the lighting efficiency of the candle is low, there will be a lighting soul guide lamp. This is the essence of the soul guide, it is a tool, the role of the tool is not only used for combat, its real role is to make up for human defects, change people's lives, and promote the evolution of all mankind! ”

After Dai Huadong finished speaking, he stared at those students and said, "Remember, if we are like those stupid × of the martial soul department, our brains are full of muscles, then the soul master will have no meaning of existence." The soul master should be an existence that explores the truth of the world and promotes the evolution of all mankind! It's not those guys in the martial soul department who either fight and kill or practice desperately all day long, and don't have much effect on human progress except for wasting resources! There are soul masters every year, but after tens of thousands of years, human beings have almost no development, and soul masters have only appeared for a thousand years, and now your lives have been turned upside down, which proves that soul masters are the future of mankind! Dai Huadong's tone was impassioned.

The students also showed excited expressions, you know, in the past, they were very unpopular with those mainstream soul masters, but today, they have discovered their own value, yes, what is the martial soul system, only the soul guide system can promote the evolution of human beings.

"But...... Dai Huadong, we are still from the martial soul department......" Xu Yiyi whispered.

The scene was very embarrassing for a while......