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Levi only knew that he was in the third school district now, and he didn't know where he was heading. In fact, he was absolutely not familiar with the school city. The places he often went to were the seventh school district where Kuroko Miko went to school and the third school district now. I knew about this third school district because he was here when he first entered the school city.

The third school district gathers most of the external facilities of the Academy City, such as the international exhibition venues where Levi took a few girls to during the Great Star Festival, and the most popular hotels and hotels in the Academy City. In general, the third school district is the external window of the Academy City, showing advanced technology to the outside world and negotiating cooperation with external companies. Levi’s first official visit to the Academy City was during an exchange activity between Mafanliang Academy and here.

“The 14th School District is the area with the most concentrated international students.”

Yuki reads out the notes marked on the map.

"Oh? International students?"

The two of them talked and walked, and soon they entered the area of ​​the 14th School District. The obvious change in the style of the buildings made people not notice it. If the many large venues in the Third School District give people a feeling of magnificence, then the scene of buildings in various countries here is like being in a world-class theme park.

Levi has heard of this place before, and seeing such a variety of architectural styles gathered together without looking messy, he couldn't help but express his sincere admiration for the coordinator of this area.

"Although the technology of the Academy City is advanced than the overall level of the earth, it has not yet reached the level of self-sufficiency based on resources circulation alone. Some necessary materials must be provided through external cooperation countries and organizations. In exchange, in addition to technical support, the exchange of international students is also one of the aspects."

There is no need to ask where this knowledge comes from in Youxi's mind. What is the difficulty of even Eve finding special life skills for her specialized in information? What's more, Levi also gave her a computer. The exquisite electronic device that is only a relatively new style in the eyes of ordinary people may be able to play a level comparable to the most cutting-edge scientific research large computer in the school city.

"Even if you can be completely self-sufficient, I think it's better not to do that. Resource circulation is really... it makes people feel a little uncomfortable."

Although it sounds like a very high-level topic, Levi unexpectedly could continue this. In fact, it is not difficult to understand when he was in the past and where he worked. How could a person who works with the entire Galaxy and even the entire universe be limited to the earth? Levi is a little forgetful and confused, but this does not mean that he forgot everything in the past. For example, when he first discovered Eve from the base of that criminal organization, he still remembers clearly that it was the same as yesterday?

"Why?"

The girl asked Levi with her expressionless and pretty face, but she didn't understand where the problem was.

"Resource circulation is the foundation of the ecosystem, and only organic life can survive and develop under this premise."

Youxi thinks that most people should understand this simple truth, especially Levi is still a high school teacher. Even if he is responsible for the language professor, he should not lack understanding of these basic common sense.

"You should know a lot of other intelligent lives in the universe, right?"

Yuxi nodded. The only people she had actually come into contact with were the people she had met on Earth. If it weren't for Levi's side, Eve, Mengmeng and Fit, she had never seen life forms on other planets with her own eyes. However, the information integration of the mind body itself is a consciousness that was finally generated by the combination of countless free information in the universe. There is no entity but by continuously extracting other information to evolve. The life form of the mind body that integrates the mind body belongs to a wide and huge network as indicated by the name. It is common to take the earth.

For example, Youxi is equivalent to a workstation, while the united thought body is a server in a corner of the distant universe. Although her humanoid terminal is restricted by the server, the server can force the instructions to her and give corresponding permissions to execute the instructions. At the same time, Youxi can also obtain the required information from the server within the scope of her own permission. It doesn’t matter that she has not been to other planets outside the earth to contact local living beings. It’s enough for her to have information like a server-like integrated thought body.

"Similar to some ultra-long-distance interstellar voyages, I have seen a fleet that simply relies on resource circulation systems to maintain survival within the ship without basically no supply."

Yuxi still doesn't understand what Levi wants to say. She also knows that the fleet described in Levi's words is common in some intelligent life that is not as advanced in technology but has consumed all the resources of the parent planet. The resources referred to here are not just food and water to maintain human survival, but mainly refer to resources such as land and environment that are easily overlooked by underdeveloped planets. People will starve to death and thirst when they lose food and water, but if they survive on a planet that is no longer suitable for organic organisms to live in, it doesn't make much sense even if there is enough food and water. In Yuxi's view, the earth is developing in that direction. Pollution is becoming increasingly serious, but countries still ignore the protection of the environment for competition and development. One day, the earth will become a dead star filled with poisonous gas.

"I spent some time in a ship like that before, and I saw them put the dead bodies into solution and decompose them into available substances... Although it is necessary for unsupply navigation in the universe, it is indeed difficult to accept anyway."

The expression on Levi's face was very subtle, and it seemed that it was a bit of a waste of lunch. However, Youxi still didn't understand his thoughts, and she still tilted her little head and seemed to be cute. In order to let herself, who lacked expressions accurately express her inner activities, Youxi gradually learned body language such as shaking her head and nodding. The tilted head was the only action she learned that could clearly express her doubts, so don't think that this alien girl was trained by someone to become a malicious and cute puppet.

"The corpses of organic life are decomposed by microorganisms and become nutrients that can be absorbed by plants and enter the animals that eat plants, and the same is true for the ecological cycle on the earth."

If the teacher in charge of biology class heard it, he would be surprised why he didn't notice that there was such a good student in the class who listened carefully. Who made Yuki look so stupid? Even if she sat upright in the classroom, it would be easy for people to misunderstand that she had been wandering around for a long time?

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