Chen Yang clicked on the icon, and then an interface similar to a mall popped up. It seemed that after so many categories inside, Chen Yang looked happy.

This system function update did not disappoint him, although there were very few products.

For daily life, there are only some towels, clothes, soap and other items, while for industrial products, there are only simple items such as bicycles and generators.

A towel costs 10 yuan and a bicycle costs 200 yuan, just like he expected. The mall here uses the default currency settlement of the earth.

It seems that there is another settlement method called redemption settlement. This function is very good. To put it bluntly, it is "for goods"

Chen Yang tried it and bought three towels in the mall. When checking, he chose the redemption and settlement method. When clicking on payment.

System prompts:

"Please select the item you want to redeemed."

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

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

System: The redemption was successful.

Blue crab: 982g

Value: 250 yuan

After seeing this price, Chen Yang was still very satisfied. Although the two-pound big green crabs cost more than 300 yuan in the Linhai market, it is already good to be able to exchange them for 250 yuan here.

After all, there is no middleman to make a difference. According to the current price he gives Zhang Fatty, the wholesale price of this big blue crab is only about 200. Speaking of which, I still earn it myself.

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

Please select the delivery address:

1. Storage space

2. Current address

This time, Chen Yang planned to choose his current address. After the selection was over, three towels suddenly appeared in his hand. He picked it up and saw that it was actually from Jieliya brand.

However, what made Chen Yang frown was that these three towels were only 60 yuan, and the exchange of green crabs was 250 yuan. Logically speaking, you should find yourself 190 yuan.

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

Seeing this, Chen Yang frowned slightly, which means that 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 redemption function seems a bit useless, but Chen Yang noticed it.

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

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

In addition to these basic disciplines, Chen Yang was the most excited about the mystery, which seemed to be able to trick into strange things.

Chen Yang tried to click on Industrial Science, but the system jumped a prompt:

Current industrial grade is: lv.1

There is also a simple note below: Upgrading industrial science will bring more industrial products to the mall, and upgrade to level 2. The mall can sell motorcycles, agricultural vehicles and other items;

Up to level 3, you can sell simple machine tools, bulldozers and other items; Up to level 4, you can sell cars, ships and other items... Up to level 10, you can sell rockets and satellites and other items.

Up to level 15, you can sell planet destruction cannons, folding space technology, and Titan destruction ships.

When he saw this, Chen Yang blinked his eyes. This was awesome, but after looking at the materials and points needed to reach level 15.

Chen Yang's face turned black, which was simply impossible to accomplish. Upgrading the technology tree requires two kinds of things, one is the material, and the other is the technology point.

At low grades, the materials are relatively simple. For example, from industrial grade one to industrial grade two, the only materials required are iron ore, copper ore and other basic metal ore.

However, the difficulty will be greatly increased when it reaches level 5. Some rare metals must be used, such as lithium, beryllium, titanium, vanadium, germanium, etc. The higher the materials you need, the harder it will be to obtain, and it is even difficult to buy in the real world.

After level 10, some materials appeared that Chen Yang had never heard of. I am afraid that those things may only be available in outer space, so it feels like a fairy tale to level 15.

In addition to materials, upgrading the technology tree requires a technology point, which is the most difficult part of upgrading. The technology point is evaluated based on the island's comprehensive talent strength.

There are currently 300 technology points in total.

However, Li Xingxing contributed half of these 300 points, surpassing 60 points, Nana contributed 40 points, and the remaining 90 people only had 50 points, while Chen Yang only had pitiful 10 points.

It seems that the algorithm of this technology point is judged based on the skills that individuals have mastered. Li Xingxing has many mechanical engineering and electronic informatics, and she has the greatest value.

Chaoyue also masters a lot of knowledge related to military industry, while Nana has mastered a lot of medical knowledge. Although Chen Yang knows a lot of knowledge, he is unfortunately not specialized, so he only has 10 scientific and technological points.

It takes 100 scientific and technological points to level two to level two, 200 scientific and technological points to level two, and 400 to level three.

It seems that every time you upgrade to level, the required technology points will double. To level 10, more than 50,000 technology points will be required. Seeing this, Chen Yang fell into deep thought.

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

Thinking of this, Chen Yang specially clicked on the medical science tree and found that the level of the medical science tree is different from that of the industrial industry, and it is only at level ten.

Level 1: Cold, fever and other medicines;

Level 2: Antibiotics and other drugs;

Level 3: Vaccines, antibiotics and other drugs;

......

After level 5, a magical drug like "Glenin" will appear, which is specially used to suppress leukemia.

Later, when it reaches level 6, some drugs that inhibit cancer cells appear, and as long as they reach level 9, there will be drugs that can even eliminate cancer cells.

As for the promotion to level 10, Chen Yang didn't even dare to think about it. The medical technology after level 10 seemed to solve the problem that Qin Shihuang wanted to solve in his dreams.

However, the experience required for medicine is twice as high as that of industrial science. It is more difficult to upgrade medicine to level 10 than to level 15 in industrial science.

It seems that the system is drawing a cake for himself. Now, Chen Yang doesn’t think too much about it. He added the existing technology points in his hand to industrial science, and handed over a few pieces of metal materials to upgrade industrial science to level three.

The system mall also changed, with some new products emerging, including motorcycles, agricultural vehicles, harvesters, heavy bulldozers, etc.

Overall, the entire system mall is very awesome, but the technology points are too difficult to obtain. Now Chen Yang is in deep thought.

You must not kidnap scientists, otherwise this book will be harmonious, but foreign scientists can try it, especially in that robber country.

However, what Chen Yang cares more is that the lifespan of those indigenous people seems to be very long and have high physical fitness, and they worship the "little ball".

Chen Yang vaguely felt that the origin of these people was also inseparable from the system. When he thought of this, Chen Yang took a look. Zero, who was still suffering in the rain, must find a way to obtain some useful information from her.
Chapter completed!