Chu Jungui dug a box of soil in the distance, added the gravel obtained from the construction of the trap and chiseled stones, put it into the refining furnace with a new module, and pressed the start button.

The refining furnace beeps and begins to work. Chu Jungui opened the part under the ribs of the battle armor, took out a small vial of gray-white powder from it, and poured it into the special inlet of the refining furnace.

At this moment, the working situation in the refining furnace is displayed on the screen, and various useful substances in the rock and soil are constantly separated, and the rest that are not specifically specified are classified as waste, which are continuously sucked up by the waste outlet, and then pressed into waste bricks of the specified shape in the waste treatment unit.

Base metals, non-ferrous metals, are left in the furnace and only after all the scrap has been cleaned up do they begin secondary refining and purification. Some of these are in the form of oxides, which are fed into the electrolysis module, where they are eventually broken down into oxygen and pure metals.

The metal in its semi-liquid state is fed into the discharge unit, where it is cooled and solidified into a standard rod, while the oxygen remains in the electrolysis module and enters a separate processing chamber. In the treatment chamber, as soon as the oxygen comes into contact with the off-white powder, it turns into fine particles and falls at the bottom of the chamber.

As oxygen continues to enter the treatment chamber, so does the number of particles at the bottom.

When the refining of the third furnace is completed, the oxygenated particles in the processing chamber increase to a critical point. The bottom of the chamber is opened, and all the particles fall underneath, which is then pressed into shape, and finally an oxygen rod is spit out.

The oxygen rod is the most basic material guarantee for human exploration of the universe. Under the action of special adsorbents, oxygen is converted into a stable solid form, and the reserves are greatly increased, and it is easier to use.

This is the first oxygen rod that Lin Xi and Chu Jungui have made since they arrived on Planet 4, and such a small one is enough for them to need it all day.

In fact, the current oxygen reserves of the two are not urgent, including the oxygen in the cockpit and the oxygen rod in the life-saving kit, which can barely support for a few days.

But the feeling of sitting on a mountain and eating is completely different from being able to have a stable supply, which can provide an important psychological massage called a sense of security, which women especially need.

After filling the refining furnace for the fourth time, Chu Jungui switched the mode of the second refining furnace, and the electrolysis module changed from extracting oxygen to extracting hydrogen. It's much easier to want hydrogen, hydrogen chloride is everywhere on Planet 4, and the content is also extremely large, and basically a hydrogen rod can be produced in one furnace.

In this way, when Chu Jungui got the second oxygen rod, he already had three more hydrogen rods in his hand.

Chu Jungui glanced at the energy supply area, forcibly suppressed the temptation to build another fuel cell, threw two hydrogen rods and one oxygen rod into the workbench, added some alloy and silicon to it, chose a design drawing, and waited silently.

At this moment, Lin Xi was a hundred meters away, exploring the surroundings while walking into the distance until he reached the top of a small hill hundreds of meters away. This is the vantage point of the surrounding area, but it was not chosen because it is all soil underneath, and there is not a whole rock as the foundation like the current site.

Lin Xi climbed the hill, looked around, and silently thought about something.

Chu Jungui's voice sounded behind her: "What are you thinking?"

"Maybe we should put this to good use. ”

"There's so much to build right now, and it's not a good place to build defenses. ”

"yes. Lin Xi sighed.

"Oh yes, I brought you a little ...... Gift. ”

"Gift?" Lin Xi turned around, with a small surprise in his heart. Will this dumb guy give a present? Could it be that Planet 4 will also have a sunny day? What will this guy give, it can't be a landmine, right?

With a full of apprehension, Lin Xi looked at Chu Jungui, and was suddenly stunned, almost unable to believe his eyes.

In Chu Jungui's hand, there was a bottle of pure water lying quietly, which was the kind of pure water in a glass bottle with a metal easy-to-pull seal.

If it weren't for the eerie purple tone of the surrounding environment, Lin Xi would have thought that he had seen it wrong. At this moment, this old-fashioned bottle of water is simply glowing.

"How could this be?"

"Water? ”

"I mean bottles. ”

"Gifts for you, naturally, have to be careful. Well, the bottle was designed by me, is it good-looking?"

Lin Xi nodded, "Hmm...... It's beautiful. ”

Chu Jungui immediately knew that this bottle was very unsightly.

In fact, Lin Xi's opinion is the same as Chu Jungui's original idea, and he feels that this soda bottle-like design in the early 20th century is not beautiful at all. However, his artistic functional component insisted on this scheme, and added a bunch of lofty labels such as vintage, elegant, and nostalgic to it, which persuaded Chu Jungui.

Chu Jungui had reservations about this artistic component, but now he has deepened his suspicions.

It seems that Dr. Zero's taste is indeed questionable.

Lin Xi took the water bottle and looked at it carefully, as if he was appreciating a real work of art. For a while, Chu Jungui was shaken again, could it be that this bottle is really good-looking?

Lin Xi sighed secretly, expecting this stupid guy to understand his mind, it seems that it will be a while. What she likes is not this water bottle, but Chu Jungui's condensed heart on this water bottle.

"Unfortunately, you can't drink it directly. ”

"Do you want to build an air-lock?"

"No, of course not, at least not now. I accepted the gift, thank you!" Lin Xi opened the armor interface and inserted the water bottle into it. The interface inside the Warframe automatically opens the cap and sucks in all the water. She took a full breath, then sighed comfortably.

In fact, the water circulating inside the armor doesn't taste bad, but it just doesn't feel good psychologically. Lin Xi also knew, but it was difficult to overcome.

With a stable supply of pure water, there is no need to continue to survive to the limit.

Lin Xi turned his gaze to the side and asked, "Jungui, why is it rare to see you cleaning up the waste?"

Chu Jun was stunned, and then understood what she was referring to. People naturally need to excrete, and the survival armor is to be active in an environment that cannot survive for a long time, so it is natural to consider this problem.

On the one hand, the Survival Warframe will mix food and water into a nutrient solution, which can maximize absorption and greatly reduce the appearance of excrement. On the other hand, the armor will also collect excrement, reuse the water after microcirculation treatment, and compress and store other waste, and take it out and release it when convenient.

The two of them have been on Planet 4 for so long, and Lin Xi has been forbearing, just because there is no privacy space. And Chu Jungui fought and worked as if nothing happened, and was not affected in the slightest.

After understanding Lin Xi's current situation, Chu Jungui browsed through several functional components, ignored the politics of Mao Sui's self-recommendation, and directly chose tactical deception.

"I've cleaned it up quietly, but I'm afraid you'll be uncomfortable, so I didn't tell you. Chu Jun returned, his face still slightly embarrassed and shy.

"I see, that's ...... I'll go over there. Lin Xi was relieved and ran to the forest.