"We read a lot of books and thought that solar energy was probably the thing that the princess needed the most.

The princess doesn't want us to pollute the environment, and solar energy is an inexhaustible source of energy, as long as the sun in the sky, or any light source, exists.

There is nothing to lose in our world.

The princess said that if the sun was gone, our earth would not exist in the first place. ”

On behalf of the students, Gakudo Island said as he looked at the solar power instrument in the experiment.

In fact, next to her, there is also a wind turbine.

They have all sailed at sea, and when they sailed at sea, they all knew that the wind could bring forward momentum.

"Although solar energy is environmentally friendly and does not pollute, it has one of the biggest drawbacks, that is, solar cells. Qinhuangdao has developed such a thing as a battery, and the princess said that this thing is a source of pollution. Not a good thing. ”

"Although this kind of thing is a polluted thing, fortunately, although this thing will be polluted for thousands of years, the toxicity will disappear, and we can't use much, if only we use it, it doesn't matter. ”

Some people have a different view.

In fact, the pulled car body, even if it is luxurious, in the case of acceleration in time and space, in the hands of Qian Rujun, it will soon be manufactured.

The savannahs lack wood, but they are not without wood.

However, for the sake of solidity, they still asked Qian Rujun for some big man's wood.

It's just that the car failed several times when it was unveiled, and the biggest problem is that the students of Xuetang Island have not encountered such a big climate gap.

Previously, they had never noticed the problem with humidity.

In the past, they knew that changes in humidity would cause rain and other phenomena, but they did not know that existing objects would be affected by a lot of humidity.

The difference in humidity made the wood dry and cracked, and it was only when it happened that they learned about it from Qian Rujun's mouth.

They thought that this was a test given to them by Qian Rujun, but they didn't know that Qian Rujun himself only noticed this situation after the incident.

The humidity of the grassland desert is not the same as that of the interior of the Han Dynasty.

Now, if they cut off the grassland from the Han in their mouths, they will be scolded by Qian Rujun.

"We were wrong, we didn't think that the arid grasslands would make our tackles useless, and that, in some sections, the luge still had to have wheels.

There are still quicksand and swamps in the desert.

When the land is not suitable for pulley, wheels must be used instead, and the load of the pulley still has a certain limit, so the facilities on the car must also be reduced.

And when you slip over, the snow melts away. When the snow disappears, the weight it can bear decreases. ”

When there is a direction to do research, the students of Xuetang Island are always very serious and focused.

For them, they find that when they have a smart mind, the best thing to do is to do research, so research can give them their full attention.

The flow of time in the space is getting faster and faster, and now twenty days is equivalent to a day outside, in order to let them concentrate on doing research, Qian Rujun has not walked outside these days, but has adopted the method of flying, so that the students of Xuetang Island can concentrate on doing research in the space.

After all, if they get the equipment out early, they can play happily outside.

Faced with the scenery that changes every day, she really wants to share it with others.

When she fell into the quicksand and flew up, she was terrified in her heart.

Spring is coming to this place gradually, but because they have been walking north and the winters in the north are longer, they don't feel much like spring is coming.

Because it is still icy and snowy, I heard that there can be more than half a year of winter near the North Sea.

But it's already spring in Metroidvania, and I've heard that the grasslands are full of flowers.

Of course, Qian Rujun used some of her previous impressions of Lake Baikal to refer to what it would be like if this place was not polluted by the environment, and one condition, this period belongs to the era of warming. With a little estimate, you can probably know the current climate and environment of the North Sea.

In a few decades, the earth will enter the Xiaoice period, and the environment in the North Sea is estimated to become very cold.

In the time of Emperor Wu of the Han Dynasty, there was a man named Su Wu who once went to Beihai to shepherd sheep, according to him, Beihai was very, very cold, and he also caught mice to eat.

It seems that rats and cockroaches are really animals that are not afraid of death.

In fact, this is very correct, in the era of Emperor Wu of Han, Beihai was in the Xiaoice period, and the cold weather made some ethnic minorities who were originally nomadic in this place move south, causing very big chaos and war in the steppe.

Under the condition that the Xiongnu disappeared, it is estimated that the arrival of these wars will be borne by the Han Dynasty!

In fact, Qian Rujun knows that trade is the biggest way to solve the shortage of materials.

As long as there is something produced in this place, no one will starve to death.

But in addition to this problem, in fact, during the Han Dynasty, most of the food produced in most places was not enough for human beings.

In order to survive, they had to rob others who could produce food and who also did not have enough to eat.

In fact, Qian Rujun knew that the Han still had a place to eat a full stomach, and even it was very simple for them to have a full stomach, that is, there were a lot of local bandits.

There are always people who don't want to do the most basic work.

Thinking of political issues, Qian Rujun decided to shake her head, she couldn't manage what happened after so long, even if she was still alive at that time, it is estimated that she had found a place to hide, as long as she made Metroida City and the five newly built grassland cities strong and rich, these people would naturally protect their cities, and they didn't need Qian Rujun to make a big move.

The nomads near the North Sea are more sparsely populated than the peoples of the steppe, because the density of the people who can feed them in that place will be less, and the nomads of this era are, in fact, very similar to the nomads of later generations, because their feeding ability is almost the same, and there is little progress.

On the contrary, the agricultural people, after the year passes, with the arrival of new crops, are constantly able to increase their productivity, and even, corn, potatoes, these things, can increase the production of wheat and rice many times, at least let them eat, there is no problem.

Once the food increases, the surplus manpower will be slowly pushed out, and the excess capacity will need to find work, and for the imperial court, if there is enough tax, they can actually hire professional military personnel.

In Chinese history, there were many dynasties that were half army and half peasant.

They were recruited when they needed to, but these peasants did not receive a salary, and their salary was the land given to them by the state. More ruthless dynasties, like the Ming Dynasty.

Even these fields would be taken away by their superiors, and when they had no way to find food, they could only become robbers to rob and live on what they had robbed, but in those days, their fighting ability was actually very weak due to poverty.

Most of the time, when they encounter a strong opponent, they can only flee desperately, often a thousand people can fight 200,000 people, and this kind of thing often happened in the era of the Japanese Invaders.

It makes people have to sigh.

Fortunately, although there was a shortage of food in the Han Dynasty, the people who came out to serve as soldiers were basically able to fill their stomachs, so most of them were actually willing to serve as soldiers.

And when a soldier returns to the township after obtaining military merits, he can get a better status, which is another important way out besides studying.

Individual human life is very cheap in this day and age.

What is precious is the whole family, and if the individual's life can be brought to the family, rich and powerful, then the individual's life can be sacrificed.

Perhaps what this era values more is actually a kind of continuation, only by continuation, can there be a future, especially when the Han Dynasty was first established, the previous Qin Empire, and the Spring and Autumn Period and the Warring States Period before it, there were constant wars, making manpower less and less.

The danger of death exists in most people.

They even killed a lot of people. From the current point of view, the people who died were actually the people of the Central Plains, and it was a pity to die!

If they had been handed down, the population would not have been so sparse during the time of Emperor Wen of the Great Han Dynasty.

On the way to the north, in addition, at the beginning, you can meet a lot of nomads, and in the end it is almost deserted, Qian Rujun found that when there are people, she wants to stay away from the crowd, but when there is no one, she wants to meet the crowd.

Even, she would, when she couldn't communicate verbally, fly down and talk to them.

Basically, when she was a woman, when she went to the tribe, although she was clean and clean, not like a steppe person, and the other party did nothing to her, at most she wanted to restrict her freedom, and what she could eat would still be given to her to eat.

When she arrived at a place, she found a very large ice cave.

When she walked down from the ice cave, she found that it was colorful and very beautiful.

"Crystal seems to be worth a little bit in this era, but the value is not too much, but ink-colored crystals can be used to make sunglasses, and in the heavy snow in winter, the function is very great.

Now there is no way to turn the glass refined by Jinmaicheng into black lenses. ”

So Qian Rujun called out ten students from the academy island and asked them to come out and dig crystals.

"Although there are a lot of crystals here, but we don't need so much, you mainly dig with color, especially the ink-colored, give you a day to dig, after digging, we make it into lenses, so that when you are active in the snow, you can prevent eye dazzle.

We don't have to go into the space to rest all the time.

By the way, if the crystal is too small, it will cause a lot of lines in the glasses. That's why you're going to have to pick a relatively large inky crystal. ”

Shangguan has an order, and as a subordinate, he naturally has to obey the order, so these ten hard-working Xuetang Island students are working as miners in it.

Qian Rujun felt that it was too cold outside, so he didn't stay outside to watch the scenery, but entered the space, in the space, in fact, if you want to see the outside world, it's okay, so Qian Rujun simply went into the space and looked at the mountains and rivers outside.

She had the feeling of seeing the world through glass.

So she prepared a lot of drinks next to her, and she was almost a god in the space.

To prepare a juice drink, she doesn't even need a juice machine, as long as she activates her ideas in order, she can create a vortex in the space, and even all the juice will not fall out.

It wasn't until Qian Rujun was preparing the cup below that they would fall into the cup, and Qian Rujun felt that if these things happened in the outside world, it was estimated that the eyes of people in the outside world would be very excited, and they would begin to worship Qian Rujun.

Fortunately, she couldn't do such a thing in the outside world.

It's amazing that the power generated by her thoughts can only be executed in space.

I don't know what the connection she has with the space.,It's impossible to do it in the outside world.。。

The earth is actually not so boring, in addition to the endless grasslands, there are also deserts, even if each desert is very different because of the presence of water and the absence of water, even the wind will not blow in the same direction, and even some places will happen because of magnetic problems, very strange impression.

Qian Rujun almost got lost inside, because the sunlight there would be affected by reflections, so that the sunlight you see is not really sunshine.

If you look at it from different angles, you will see that the sunlight appears in different places.

Originally, the magnetic needle could find out the direction, but in this place, the magnetic force will fail.

If you keep the magnetic needle fixed in the same direction, it will rotate all the time, and when you see the magnetic needle that keeps rotating, it is difficult to know that there is no problem with this place.

Countless crescent mounds are also used as directions in the great desert.

But in the vicinity of the North Sea, this cannot be done.

With the wind flipping, the wind direction in the desert is not fixed, many people think that the direction of the crescent hill is fixed, and walk along the sliding direction of the crescent hill, but they don't know that with the difference between the season and day and night, the wind direction in the desert is not fixed.

The North Sea region is also a place where high pressure is formed, and the wind direction here is inherently uncertain.

Because the wind blows from high pressure to low pressure, and will rotate clockwise or counterclockwise, depending on whether it is in the northern hemisphere or the southern hemisphere.

Of course, the Crescent Hill can still believe in the direction of the crescent, but it is basically impossible to believe it in the Beihai region, it depends on where the high pressure is now, whether it is in the east or the west, the wind direction here will be completely inconsistent, and the high pressure is not a fixed thing, it will run.

Of course, the general direction of the high pressure is to the south, but it will also stay in place and turn in circles, and even appear in irregular directions, which will affect the wind direction in the North Sea region.