Chen Yang clicked on the icon, and then a mall-like interface popped up, it seems that after so many categories in it, Chen Yang's face was happy.

This system function update really did not disappoint him, although the variety of goods is pitiful.

In the living category, there are only some towels, clothes, soap and other items, and in the industrial category, there are only simple items such as bicycles and generators.

A towel is 10 yuan, and a bicycle is 200 yuan, just as he expected, the mall here uses the earth's currency settlement by default.

There seems to be another settlement method, called exchange settlement, this function is very good, to put it bluntly, it is "barter"

Chen Yang tried it, bought three towels in the mall, and then when checking, he chose the method of exchange and settlement, and when he clicked on payment.

System Prompt:

"Please select the item you want to redeem. ”

Immediately afterwards, the system asked Chen Yang to make a choice, whether to exchange the items in the storage space or the items in his hand.

Chen Yang chose a blue crab in the storage space and clicked the exchange button.

System: The redemption is successful.

Blue crab: 982 grams

Value: 250 RMB

After seeing this price, Chen Yang is still very satisfied, although the two-pound blue crab is sold for more than 300 yuan in the Linhai market, but it can be exchanged for 250 yuan here, which is already good.

After all, there is no middleman to make the difference, according to the current price he gave to Zhang Fatzi, the wholesale price of this big blue crab is only about 200, speaking of this exchange function, or I earned it myself.

Chen Yang was very satisfied with this exchange function, and then clicked on payment, and in the next second, the blue crab in the storage space disappeared, and the system popped up a selection menu.

Please select a delivery address:

1. Storage space

2. Current address

This time, Chen Yang planned to choose the current address, and after the selection was over, three towels suddenly appeared in his hand, and when he picked it up, it turned out to be a Jieliya brand.

However, what made Chen Yang frown was that these three towels were only 60 yuan, and the blue crab exchange was 250 yuan, so it stands to reason that he should find himself 190 yuan.

But the system did not look for money, but put the money after the exchange balance into the wallet of the mall, and did not return to Chen Yang's wealth value.

Seeing this, Chen Yang frowned slightly, that is to say, the currency exchanged in the mall is only allowed to be consumed in the mall?

This is a bit depressing, there are too few types in the system mall, and this exchange function is a bit chicken, but Chen Yang noticed it.

Next to the system mall, there is also an icon that looks like a tree, Chen Yang clicked on it, and an icon that looks very similar to the technology tree pops up.

Chen Yang stared at this technology tree for a while, and found that this technology tree was very complex, including life, industry, chemistry and electronics, with a total of more than ten categories.

In addition to these basic disciplines, what excites Chen Yang the most is the occult, which seems to be able to make strange things.

Chen Yang tried to click on the next technology, but the system popped up a prompt:

The current industrial grade is: Lv.1

There is also a simple note below: upgrading the industry will bring more industrial products to the mall, and when it is upgraded to level 2, the mall can sell motorcycles, agricultural vehicles and other items;

When you reach level 3, you can sell items such as simple machine tools and bulldozers, and when you reach level 4, you can sell items such as cars and ships..... Reach level 10 to sell items such as rockets and satellites.

Upgrade to level 15, you can sell the Planet Destruction Cannon, Folding Space Technology, and Titan Destroyer.

When he saw this, Chen Yang's eyes blinked, this is too awesome, but he looked at the materials and points required to reach level 15.

Chen Yang's face darkened directly, this is simply impossible, there are two things needed to upgrade the technology tree, one is the material, and the other is the technology point.

At low grades, the materials are relatively simple, such as upgrading from industrial grade 1 to industrial grade 2, and the only materials required are some basic metal ores such as iron ore and copper ore.

But when you go up to level 5 or so, the difficulty increases greatly, and some rare metals must be used, such as lithium, beryllium, titanium, vanadium, germanium, etc., and the higher you go, the more difficult it is to obtain, and even the real world is difficult to buy.

And after level 10, there will be some materials that Chen Yang has never heard of, I'm afraid those things may only be found in outer space, so it feels a bit fantastical to reach level 15.

In addition to materials, upgrading the technology tree requires technology points, which is the most difficult part of upgrading, and the technology points are evaluated according to the comprehensive talent strength of the island.

There are currently a total of 300 tech points.

However, of these 300 points, Li Xingxing contributed half, surpassed contributed 60 points, Nana contributed 40 points, and the rest of the 90-odd people added up to only 50 points, while Chen Yang only had a pitiful 10 points.

It seems that the algorithm of this scientific and technological point is judged according to the skills mastered by the individual, like Li Xingxing has a lot of mechanical engineering and electronic information, and she is the most valuable.

And Transcendence also has a lot of knowledge related to the military industry, Nana has mastered a lot of medical knowledge, and although Chen Yang knows a lot of knowledge, it is a pity that he has no specialization, so he only has 10 scientific and technological points.

It takes 100 tech points to move from Level 1 to Level 2, 200 Tech points to Level 2, and 400 to Level 3.

It seems that every time you upgrade to a level, the required technology points will be doubled, and to level 10, you will need more than 50,000 technology points, seeing this, Chen Yang fell into deep thought.

Is it that he kidnapped thousands of scientists from the real world to the island, and the technology tree can be unlocked?

Thinking of this, Chen Yang deliberately clicked on the technology tree of medicine and found that the level of the technology tree of medicine was different from that of industry, only level ten.

Level 1: Medicines for colds, fevers, etc.;

Level 2: Antibiotics and other drugs;

Level 3: Vaccines, antibiotics and other drugs;

......

After the fifth level, there will be a miracle drug like "Glenin", which is specially designed to suppress leukemia.

Later, when it reaches the sixth level, there are some drugs that inhibit cancer cells, and as long as it is upgraded to the ninth level, there are drugs that can eliminate even cancer cells.

As for being promoted to level ten, Chen Yang didn't even dare to think about it, and the medical technology after reaching level ten seemed to solve the problem that Qin Shi Huang had ever dreamed of.

It's just that medicine requires twice as much experience as industry, and it is even more difficult to get medicine to level 10 than to level 15 in industry.

It seems that this is the system painting cakes for himself, and now, Chen Yang doesn't think too much, he adds the existing science and technology points in his hand to industry, and by the way, he hands over a few pieces of metal materials, and raises industry to the third level.

The system mall has also changed, with some new products appearing, including motorcycles, farm vehicles, harvesters, heavy bulldozers, and so on.

In general, the entire system mall is very awesome, but the technology points are too difficult to obtain, and now Chen Yang is in deep thought.

I definitely can't kidnap scientists, otherwise the book will be harmonious, but foreign scientists can try it, especially the robber country.

However, what Chen Yang cares about more is that the life span of those aborigines seems to be very long, and their physical fitness is very high, plus they worship the "little round ball".

Chen Yang vaguely felt that the origin of these people was also inseparable from the system, as soon as he thought of this, Chen Yang looked at it, Zero, who was still suffering in the rain, must find a way to get some useful information from her.

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