It is unknown whether Li Wensheng switched to diesel Chen Xin, but after he made another oxygen concentrator, the materials on hand were also exhausted, and the remaining six group friends who needed the oxygen concentrator could only wait for him to obtain new materials from Qin Lan before they could get the goods.

The other six group members who knew this naturally couldn't hold back, and in this case, waiting for one more day would increase their chances of encountering danger by one point.

But gathering materials is not an easy task.

Among the materials Chen Xin needed to make oxygen concentrators, glass is the easiest to obtain, after all, if you don't mind breaking glass, this thing is really everywhere now.

In terms of pipelines, it is easy to say, if you go to the community where no one lives anymore and demolish it, you can still make up more or less.

It's just a vacuum pump and a fill light, these two are not easy to collect, and the fill light has two group members who have their own spare parts, but there is really no one else to have a vacuum pump.

So despite the urgency, except for the "doctor" who got the oxygen concentrator quickly, Li Wensheng and two other group friends, the other six group members still have to wait until next month.

Sending out four oxygen concentrators, plus Mo Qingyan's harvest, Chen Xin received a total of 600 survival points, as well as an additional 16 daily survival points every day.

Now Chen Xin has been able to harvest 18+16 survival points every day, and his monthly income has exceeded 1,000 points.

This is really a rapid improvement compared to when Chen Xin first obtained the system, when his monthly income was only more than 300 points.

This also made Chen Xin understand the method of obtaining daily survival points in the system.

One of the ways he was now using was to improve his shelter conditions.

One is to help others and improve the living conditions of more people.

Both have their own advantages and disadvantages, and it is not said that the latter is necessarily better than the former, but one may be slower to survive, and the other is faster but has certain dangers.

After all, under the catastrophe of the last days, the darkness of the human heart breeds, and it is necessary to grasp the degree of helping others whether it helps others or harms oneself.

Therefore, it is more appropriate to help others appropriately, let yourself get more survival points, and at the same time create a safer and more comfortable shelter for yourself, which is a more appropriate way to ensure your own safety.

And Chen Xin, who finally became rich at hand, still didn't suppress his desire to upgrade after all, and upgraded the kitchen.

The kitchen is where Chen Xin considered upgrading at the beginning of obtaining the system, and the place where the induction cooker and kitchen utensils were originally placed was transformed into a formal stove after Chen Xin upgraded, and there was an extra row of cabinets on the wall, which finally looked like that.

However, the upgrade of the kitchen did not bring Chen Xin a new daily survival point acquisition.

This is not too difficult to understand, after all, even if the kitchen is upgraded, Chen Xin still eats those things every day.

Unless it means that he can get more ingredients and can use the kitchen to cook exquisite and delicious dishes, it can be regarded as improving the living conditions.

As for the medical room, because there was still a lack of some materials, Chen Xin could only wait for Qin Lan to send the materials and materials he wanted this month before he could upgrade.

Otherwise, he would have to spend 10 times as many survival points to level up.

Although it is not impossible to say this, Chen Xin still insists on saving if he can.

And in addition to upgrading the medical room, he also has to upgrade the power system, which is a big head.

After all, Chen Xin's planned power system also needs to be connected to biogas fuel cells, and if you want to have biogas, you must first build a biogas digester.

The biogas digester must not be dug on the spot, it can only be obtained with the help of upgrading the algae oxygen generator, plus the fuel cell, this survival point must be kept.

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Qin Lan's delivery time was quite punctual, although in the last days, everyone no longer cared too much about the time and date, but Qin Lan's side still sent the materials that Chen Xin asked for at the beginning of each month on time.

"Ah Xin, your gate is well repaired!" Qin Lan couldn't help but praise the door and entrance of the shelter, which had become completely different from the last time she came.

Hearing Qin Lan talk about this, Chen Xin's heart couldn't help but burst, this was the first time he had really exposed what he had upgraded through the system in front of others, which inevitably made him a little nervous.

So he asked Qin Lan casually, "Ah Lan, do you think it's good?" ”

"Of course it's very good, Ah Xin, you are doing the construction by yourself, it is already very powerful to be able to build like this, and the general construction team may not be able to do this." Qin Lan didn't seem to notice any disobedience, but praised Chen Xin's craftsmanship: "When I was with you, I knew that you were skillful, but I didn't expect Ah Xin that you still have such skills." ”

"I didn't have a chance to show it before, did I?" Chen Xin could only smile at this time.

Through Qin Lan's reaction, Chen Xin seemed to understand what the concept of information states meant by the system.

For example, the gate of this shelter, Qin Lan can definitely see at a glance that this is not something that Chen Xin can complete, but the vague concept of the information state of the system makes Qin Lan think that this is Chen Xin's own construction and transformation.

The concept of this information state is vague, and it is difficult for Chen Xin to understand what level of technology it is, but it does not prevent him from understanding its effect.

Simply put, make everything reasonable and not make people perceive the anomaly.

The upgrade of the shelter will be thought that this is a transformation made by Chen Xin himself, and the appearance of new items will also think that Chen Xin made it himself or where to buy it, in short, it is to make everything reasonable.

Chen Xin didn't know if this was considered a wisdom reduction aura, after all, this level was only a rationalization of the appearance of various items, and it was not a wisdom reduction.

Chen Xin didn't bother too much about this problem, and soon left it behind.

Moving the supplies brought by Qin Lan into the shelter, Chen Xin still beckoned her to sit down and drink water.

Qin Lan didn't refuse, sat down on the sofa in the living room, looked around, and then suddenly asked Chen Xin, who was pouring water for her, "Ah Xin, didn't you prepare heating equipment?" ”

"Heating equipment? Yes, I prepared an electric heater and an electric blanket for sleeping at night, which should be enough. Chen Xin was a little surprised when he heard Qin Lan ask him about the heating equipment, but he still replied: "I am in the mountain, and the walls were also insulated when I built the shelter, and the temperature was not too low, and an electric heater is usually enough." ”

"Your shelter is so big, there is only one electric heater, it can only warm one place, and the room is still cold overall, right? And you're still growing vegetables in the greenhouse, so the temperature in the greenhouse can't be too low! Hearing Chen Xin say this, Qin Lan couldn't help but be a little worried.