The next day, Meng Mengliang, Ye Feng left the experimental building and went outside to hunt zombies.

After a night of thinking, Ye Feng finally decided to stay, after all, Zhang Ying was a loyal subordinate with great potential.

If nothing else, with Zhang Ying's domineering ability and Ye Feng's twenty years of experience in the end of the world, it is definitely not difficult to build Zhang Ying into a nine-star powerhouse, and a nine-star powerhouse who adapts to regeneration ability is almost an immortal and immortal existence.

This time, Ye Feng came out to hunt zombies, and he kept a lot of low profile, not like yesterday, when he whistled and started killing, he finally attracted a second-order butcher and fled in embarrassment.

The second-order zombie yesterday gave Ye Feng a wake-up call, even if he had experienced the end of the world and had twenty years of combat experience, if he was not careful, he would still capsize in the gutter.

Now Ye Feng is very careful, and he is not in a hurry for quick success, he would rather clean up the zombies room by room, waste more time, and not fall into the zombie group.

Ye Feng's cleaning route did not choose to be in Ya Academy, but along the Bayi Road outside Ya Academy, because there are still many surviving students in Ya Academy, once the school zombies are almost cleaned up, these students will run around, maybe they will run to the experimental building and find Zhang Ying inside.

The current Zhang Ying, although his body is recovering, but he looks very scary, don't be killed as a monster by these students, after all, Zhang Ying has no power to resist now.

Ye Feng came out to clean up the zombies at seven o'clock in the morning, and it was not until six o'clock in the afternoon when the sun set that he returned to the experimental building, then locked the door and walked directly to the third floor.

For the sake of safety, Ye Feng did not plan to go out at night to clean up the zombies, after all, the eyesight of the zombies at night surpassed that of humans, and at night, it seemed that the zombies were even more crazy, and their combat effectiveness had also increased.

Zhang Ying, who was lying on the tightrope bed, still had not recovered his eyes, but his hearing had recovered a little, and he could hear Ye Feng's voice coming back.

"Don't move!" Ye Feng walked to Zhang Ying's side, looking at Zhang Ying who was about to get up, Ye Feng stopped him softly.

Zhang Ying was very obedient, lying motionless on the bed, with a thought imprint, Ye Feng is her heaven, whatever Ye Feng says, she just needs to obey, subconsciously obey.

Ye Feng bypassed the wire bed, came to the test bench, lit the alcohol lamp, put a beaker filled with water on the alcohol lamp holder, and began to boil water.

While boiling water, Ye Feng opened the milk powder can, dug out more than a dozen spoonfuls of milk powder from it, poured it into a bottle, and prepared to mix milk powder for Zhang Ying.

The temperature of the alcohol lamp is very high, about 800 degrees, and the boiling speed is naturally very fast, and after a while, the water in the beaker has been boiled.

Ye Feng mixed boiling water and cold water together, keeping the temperature at about 45 degrees, then poured it into a bottle full of milk powder, and after mixing the warm milk powder, he came to Zhang Ying's side and gently lifted Zhang Ying's head.

Before Zhang Ying was branded with spirit, Ye Feng didn't care about the other party at all, and mixed it with cold water at will, as long as he could drink it, regardless of the taste.

Now it's different, Zhang Ying is Ye Feng's loyal subordinate, so naturally he can't be treated badly, I have to say that Ye Feng is a real person.

Ye Feng is not a great benevolent person, his kindness is limited, he can't be like the sun, shining the world and giving to the common people, he can only give it to the people around him.

"You have a good rest, I'll go extract the evolution liquid, with enough evolution liquid, you should be able to recover your eyesight tomorrow." After feeding Zhang Ying's milk powder, Ye Feng gave an order, and then walked like a test bench.

During the day today, Ye Feng had almost no rest, and had been hunting zombies door to door, and after more than ten hours of hunting, he had gained a lot, and there were more than one hundred and fifty crystal nuclei in his pocket.

Of course, if it weren't for Ye Feng's encounter with the three-headed second-order zombies before and after during the cleanup process, he would have obtained more crystal nuclei.

"Looking at the color of these crystal nuclei, it should be possible to extract four evolutionary liquids!" Looking at a small bag of crystal nuclei, Ye Feng secretly calculated while sorting out the test equipment.

The extraction process requires a high degree of mental concentration, and it takes at least five hours to extract four evolutionary fluids.

Moreover, this is still Ye Feng's skillful hands and feet, and the method used is also the most advanced fifth-generation extraction method, if the most primitive extraction method is used, I am afraid that Ye Feng may not be able to complete the extraction even if he is this time tomorrow.

When he is busy and focused, time often passes quickly, and at midnight, Ye Feng successfully completed the extraction of the evolution liquid, and as expected, he obtained a total of four evolution liquids.

Without the slightest delay, Ye Feng, who was sweating profusely, came to Zhang Ying's side with four evolutionary liquids and said, "You haven't slept yet, have you?" ”

"No ,,," Zhang Ying opened his mouth and uttered a somewhat vague syllable, and after recovery, he could already pronounce the syllable simply, and even say simple words intermittently.

"I'll inject you with the Evolution Fluid now." Ye Feng nodded, didn't continue to say more, and gently raised Zhang Ying's wrist.

After injecting two pieces of evolution liquid in a row, Ye Feng put down Zhang Ying's wrist, and then came to the side, opened the milk powder can, and began to mix milk powder.

Ye Feng did not inject Zhang Ying with four pieces of evolution liquid at one time, but planned to leave it until tomorrow morning, so that the injection could be divided into different ways, so that the evolution liquid could be used better and more reasonably.

After mixing the milk powder and giving it to Zhang Ying to drink, Ye Feng moved his body, said hello to Zhang Ying, and prepared to walk like the temporary bedroom next to him.

Ye Feng is very tired now, killing zombies for more than ten hours in a row during the day, and the consumption of physical strength has almost reached the limit, after coming back, he has been non-stop, concentrating on extracting the evolution liquid, and after doing all this, a feeling of fatigue hits, even if the body of a one-star evolutionary is a little unbearable.

"Thank you、、、 thank you!" Sensing Ye Feng, who was leaving, Zhang Ying opened his mouth slightly and said vaguely.

Although Zhang Ying couldn't see it, he could hear it, and he knew from Ye Feng's mouth that he was injected with an evolution liquid just now, and he also knew that extracting an evolution liquid would require killing at least dozens of zombies.

These zombies, Zhang Ying has seen, not to mention dozens of them, even one zombie is difficult to kill, and Ye Feng injected her with two evolutionary liquids at once, that is, nearly seventy or eighty zombies were killed.

And after Ye Feng came back, she has been busy, and the sound from the test bench, Zhang Ying can clearly feel Ye Feng's busyness, this busyness is all for her, which makes her desperate heart very moved.

Hearing this, Ye Feng was stunned, but then smiled, did not speak, and walked into the temporary bedroom.

Ye Feng did this, it was completely a transaction, not a good intention, if Zhang Ying didn't agree at the beginning, Ye Feng was too lazy to go out to hunt zombies, extract the evolution liquid, and leave directly.

Ye Feng walked to the bedroom, fell on the bed, and slept with his head covered.

He was so tired, hunting zombies was not an easy job, not only was it very physically exhausting, but it also required mental concentration, continuous slashing, Ye Feng not only had soreness in his arms, the tiger's mouth cracked, and even the thick high-strength alloy war knife began to roll up.