More than 500 years ago, Rosenberg, the founder of card theory, first proposed the card theory and successfully produced the first card. Since then, after more than 500 years of development, a variety of cards have emerged. Prior to this, primitive card rudiments existed in large numbers in various religions, and they were considered an unnatural force. To this day, there are still many highly skilled card makers and carthes in some religions, whose origins even date beyond the time of Rosenberg, and in this respect, their lineage is even more mysterious.

But it was Rosenborg's birth that completely shattered the mysterious aura on the card system. He systematically studied and elaborated on the card structure, and invented many cards, such as today's energy cards, whose standard structure was first proposed by Rosenborg. The mysterious aura shrouded in the card has been completely broken, and card science has become a new discipline.

About 300 years ago, another great card maker, Heiner Van Sent, ushered in a golden age for the development of cards. The year of Heiner Vansent's birth was exactly two hundred years after Rosenberg formally proposed the card theory. These two of the greatest card makers of the past 500 years seem to echo in this way.

The era in which Heiner Van Sente lived was an era of heroes. In those 100 years, countless cards were invented by many talented card makers, and Heina Vancent, as a great card maker on a par with Rosenborg, led the invention of as many as 97 kinds of cards. During that period, many famous card makers emerged, such as Rozzie, Chemosikh, and so on.

After so many years of development, today's card science is very different from 500 years ago. The whole discipline has become more detailed, with many branches and more in-depth research.

With the establishment of diplomatic relations between the Mohadi Domain and the Baiyuan Mansion, the card theory of the Tianyou Federation was introduced to the two domains, and the outstanding people of the two domains quickly absorbed it, and according to the characteristics of their own domains, they developed a unique card theory suitable for their two domains. As a result, the card theory system has been further supplemented and expanded, and new cards have emerged one after another. It was a glorious era, and it was an era that countless people deeply yearned for.

With the continuous development of the card theory system, the emergence of various strange cards, the division of card types is becoming more and more difficult. Until now, there has been no authoritative way to divide it.

However, there is one of the most straightforward and easiest ways to know exactly what a card does, and that is to use it!

The use of cards requires the use of a measuring instrument, which, coincidentally, was also invented by Rosenberg, the founder of card theory, and perfected by Heiner Vansent. Although today's degree meter is becoming more and more sophisticated, and there are more and more auxiliary functions, such as Chen Duan's meter has a searchlight, but its core has not changed in the slightest.

From the outside, the meter is a rectangular box with three buckles that can be fastened to the arm. There is a card slot at the top of the meter, which is used to use the card. Generally speaking, the meter has at least two card slots, and the more advanced the card slot, the more the number. One of the two card slots uses a basic card such as an energy card, and the other slot inserts the card that the user wants to use. To put it bluntly, the meter is a device that connects the energy card with other cards, and the energy card provides energy to excite the card to achieve the purpose of use.

Of course, Chen Dui's meter will not be a high-end product, what high-end goods can more than 200 Oudi buy? This is an extremely widely used item, but Chen Duan is rarely used.

Without hesitation, I inserted this card into the slot above the meter, and picked an unused one-star energy card and inserted it into the slot below. After doing all this, Chen Du took a deep breath, and then pressed the activation button on the meter surface.

"Drop!"

Chen Du suddenly appeared a translucent light curtain with a line of words on it.

"The energy card does not meet the specifications, please use an energy card with more than three stars!"

Samsung Energy Card! I actually want an energy card with more than three stars! Chen Dui, whose face was full of surprise, had already determined that this card was an out-and-out premium card. Generally speaking, the more advanced the card, the higher the level requirements for the energy card, and the faster the energy consumption rate. This common sense is still there.

But Chen Duan was a little troubled again. He doesn't have a Samsung energy card, if you want to know what kind of card this card is, you have to buy a Samsung energy card. However, the price of the Samsung energy card is not a small amount!

The energy capacity of a one-star energy card is 100 calories, the energy capacity of a two-star energy card is 1,000 calories, and the capacity of a three-star energy card is up to 10,000 calories.

The uniform retail price of a one-star energy card is one hundred and ten odds, that is, an average of one calorie of energy is one ounce. The price of a two-star energy card is 1,250 euro di, and on average, one card of energy requires 1.25 euro di. The price of a three-star energy card is as high as 15,000 odds, and on average, a little energy requires 1.5 ohs.

This is also why the one-star energy card is the most widely used, after all, there are still the most poor people in this world.

In the past three years, he has been frugal, working all night, and his net worth is only 80,000 Odi. To take out fifteen thousand odds at once, he was very hesitant. Having experienced a wandering life since childhood, he values money more than ordinary people, because he knows that it is the most basic of life.

After hesitating for a long time, reason finally triumphed over impulse, and Chen Du decided to put it aside for a while. He didn't throw away the two films that were posted on the card, but collected them.

Yuzi regained his composure, but Chen Duan had a more habit, every day he couldn't help but put this card in his hand to play, every time he looked at this card, he would be immersed in the complex and perfect structure.

But life had to go on, and he didn't do nothing during this time, he managed to set the paperclip compression structure of another one-star energy card with a different structure into his own structure, which made him make a one-star energy card that once again reduced the cost of two odi. That is, he now earns fifty more oodi per day than before.

It can be said that the structure of the one-star energy card he is making now is quite different from the standard structure, but if you don't look carefully, it's hard to see. However, who would carefully study the one-star energy card they just bought?

The last time Uncle Hua gave him the lecture card, he took it out, and according to the date, it was today.

The training class was held in a building next to Dongwei Academy, and Chen Du originally thought that not many people would come to participate, but when he walked into this classroom, he found that it was noisy inside. There are all young men and girls sitting inside, and the young people are naturally quickly mingled together, laughing and scolding, piling up in a pile of threes and fives, and having fun.

Chen Du casually found a seat by the window and sat down. Years of wandering life have given Chen Du a lot of experience in observing faces. After a quick glance, he realized that the family background of these people was just ordinary. Think about it, if the family has money, how can they send their children to such a low-level training class? If you want to send it to Dongwei Academy, you will also send it to Dongwei Academy.

Looking out the window at the Dongwei Academy, which is only separated by a wall, from this position, the Dongwei Academy's playground can be seen at a glance. With neat and clean uniforms, confident smiles, and polite greetings to each other, the demeanor of the students of Dongwei Academy is eye-catching.

Inexplicably, Chen Du felt a little uncomfortable, and a trace of bitterness quietly rose in his heart. Retracting his gaze, Chen Duan sat for a long time, and when he came back to his senses, he couldn't help but laugh dumbly.

What's wrong with you? Three years ago, I was afraid that I would never have dreamed of living such a life, and now, what am I not satisfied with? I secretly told myself in my heart that I must be content, I am already very lucky!

Chen Dui, who had figured this out, turned his gaze to Dongwei Academy again, still with a faint envy in his eyes, but he was unusually peaceful.

At this moment, the instructor walked into the classroom, and the classroom immediately fell silent.

The teacher who gave the lecture was a young man in his twenties named Jia Ming. He looks average, but he has a very neat mouth. At the beginning, he said a lot, saying that he was a direct disciple of Professor Jia Ziling of Dongwei Academy, and it was a partnership with Dongwei Academy. didn't boast and agitate, but the eyes of the group of students below lit up.

Chen Du frowned when he heard this, the wandering life since he was a child gave him insight into the world, which was far from being comparable to these girls and boys. In his opinion, this lecturer is far more like a liar than a card maker.

The boast took half an morning.

Half a morning disappointed Chen Dui, this Jia Ming was completely reading from the book. In the past three years, Chen Du has been studying on his own, and he has read no less than 100 basic books, many of which are ripe. He even knew that Jia Ming was now reading according to the "Introduction to the Fundamentals of Card Theory" compiled by Wang Jing in the 04th edition.

He has turned this book more than ten times, but because his foundation is too poor, many places are still a little unclear.

Soon he was concentrating.

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