The breakthrough of the fourth level of body enhancement made Shen Yan's body feel full of infinite power, if it wasn't for Guan Feng urging him again, I am afraid that he would continue to stay and fight for a while, to experience how powerful the strength that his body can show after reaching the fourth level of strengthening.

There are probably five aspects of human physical fitness.

The first is speed, which is the distance the human body moves per unit of time, or the ability to respond quickly to external stimuli. The second is force, which is the force produced when the muscles of the human body contract; The third is endurance, which refers to the body's ability to perform muscle activity and resist fatigue for a long time; The fourth is agility, which refers to the ability to quickly change positions, change movements, and adapt to changes. The last one is flexibility, which is the force and stretch of the muscles and ligaments of each joint during human activity.

Among the five qualities, speed and strength are reflected in the range value, usually the speed of ordinary people is about 13 seconds and 100 meters, and the strength is about 50-150 kilograms. As for the other three aspects, in view of the fact that today's human beings are in a sub-health state of inactivity for a long time, so that everyone's performance will be different, and people who exercise regularly will of course be stronger than people who do not exercise in these aspects.

Shen Yan's body broke through to the fourth level of strengthening, and theoretically his physical fitness would be increased by four times on the original basis. But in fact, it is not, in addition to the obvious changes in strength, although there are also changes in aspects such as speed, but not as profound as power. If you want to truly give full play to the effect of strengthening these qualities, you can only keep honing them. Fighting is one of the methods.

As Mira's direct host, Shen Yan's physical enhancement was much more affected than that of a worker ant like Guan Feng, and even the brain domain was greatly expanded under its feedback, and Shen Yan's endurance and neural reaction ability were particularly affected.

I don't know much about Mira Shen Yan, the only thing I know is that he doesn't belong to the earth creatures, he can open the door to evolution for himself, and he can help him build an anthill.

According to the other party's statement when he first came into contact with Mira, Mira is a biological brain transformed from insect creatures, and in Shen Yan's impression, words like Zhi Brain seem to only appear in science fiction novels, and it is a very powerful existence. Controlling space warships is more powerful than the earth's supercomputer, and it has many times more computing power, overall planning ability, and so on. But the strength that Mira has shown now is not like this, the only bioradar ability is also the impact of its enhancement level.

Mira's place is like this, everything is still because of the strengthening level, and there is also a more important reason, that is, inheritance. In the cave of Xuanyuan Peak, there is not only the inheritance that Shen Yan needs to obtain, but also the inheritance that Mira needs to obtain.

The inheritance is very mysterious, but it is also very dangerous, every time Mira communicates with Shen Yan, she will urge him to accept the inheritance, but every time Shen Yan thinks of the danger when the other party leaks his mouth, he will tremble and lose his thoughts. But the appearance of Ling Yan Thirteen in this rescue operation gave Shen Yan a strong sense of crisis, and the appearance of this sense of crisis made him think of inheritance!

"When I get home, arrange my parents well, I can't really go to Xuanyuan Peak again!" Catching up with Guan Feng all the way to the car they found, Shen Yan thought like this in his mind after getting in. It's all because of a sense of crisis, a subconscious behavior!

There were two buses that opened the road before, and Shen Yan had very little obstacle to their actions, and the three cars were driving off-road very quickly! It didn't take a few minutes to see the bus in front of me. As the road conditions gradually got better and better out of the city, this made the bus in front of it run very fast, avoiding the recurrence of the previous situation of mutant cats rushing into the bus. Although mutant cats have been strengthened by the virus and become much faster, they are still a little inferior when facing cars that let go of speed.

The gunfire on the guards' side grew louder and louder, and from the dense gunfire and the occasional roar, everyone in the convoy could feel the fierceness of the battle there. Shen Yan's off-road vehicle quickly overtook two buses, and he was in a very anxious mood now, and he was eager to know the actual situation on the Weijun's side.

With the passage of time, the journey of less than ten kilometers was completed in a blink of an eye, and Shen Yan could clearly see the six-story building in the distance through the car window, as well as the tongue of fire that continued to pour out of the building. At the same time, the re-enhanced eyesight also allowed him to see the mutant beasts surrounding the building, which were a mixed team of mutant cats, dogs, and mutant rats, among which the dense swarm of rats seemed to be at least thousands.

"The attacks of these mutant beasts don't seem to be strong! It's better to say that they are under siege! As the distance continued to close, Shen Yan saw that the mutant beasts around the building did not seem to be in a hurry to attack the guards, but kept wandering around, it seemed that the firepower on the guards' side was very fierce, but there were not many mutant beasts that were really eliminated.

"These damn brutes even know how to fatigue tactics, they obviously want to drag the guards down and drag them down, and then rush forward in a swarm!" Hearing Shen Yan's words, Guan Feng also frowned and said.

"Don't worry about it so much yet, let's rush in!" Shen Yan decided: "The night is really not good for us, we can only hold on until dawn!" ”

"That's all there is to it!" Guan Feng nodded in response.

The defense of the building is very perfect under the establishment of the guards, the six-story building is boxy, and the windows on the lower three floors are all guardrailed, and it is difficult to break through with the strength of the mutant beast now! All the vehicles were divided into two groups by the guards, one group was mainly armored vehicles and personnel carriers, and they were parked directly at the door, forming a pillbox-like defensive line, and if you want to break through, you only need to rush out of the door to get on the car directly. The other group is parked on the road a kilometer north of the building, where a platoon of more than 100 people is stationed and can echo the building at any time.

In other words, the number of people fighting against the mutant rat colony on the outside of the building at the moment was actually only about 300 people!

Guan Feng agreed with Shen Yan's opinion that he relied on the building to defend and wait for Tianming, anyway, there were peripheral support forces to echo, even if the number of mutant beasts really increased suddenly, it would not be difficult to break through under the combination of inside and outside. On the contrary, it is the easiest to break through in this state of blind light in the dark, and it is the easiest to have an accident.

The convoy rushed all the way to the main entrance of the building without stopping, and the guards who received the news immediately sent someone to answer at the door. The mutant beasts outside the building seemed to be waiting for Shen Yan and them to enter the building, and they didn't attack the soldiers in the convoy when they entered the building! And just as the mutant beast was encircled again, an off-road vehicle suddenly rushed out, rushed onto the road under the crushing all the way, and finally disappeared! After seeing the off-road vehicle rush into the darkness, Shen Yan turned around and walked into the building.

"Head, I suggest that we break through immediately now, those damn cats and dogs are too fast, it's too wasteful of gunpowder for us to resist like this. And they are constantly harassing, so that our fighters' nerves are always in a tense state, so that even if it is daylight, if you want to break through, you don't have the strength! As soon as Shen Yan walked into the building, Wei Jun greeted him first and said.

"Don't worry, just let everyone save ammunition and put two shots from time to time! Just take care of the windows and doors and let them hit the wall. Shen Yan smiled and said: "In short, it is loose on the outside and tight on the inside, just let everyone take turns to rest and monitor their movements!" ”

"Ugh!" Faced with Shen Yanyun's indifferent and breezy attitude, Wei Jun couldn't help but be stunned.

Shen Yan patted the guard on the shoulder, "Okay, hurry up and make arrangements, don't let the brothers waste time with those beasts!" ”

At the top of the corridor on the left side of the first floor of the building is a conference room, where Cheng Yanqiu and the rest of the people were arranged after entering the building. Shen Yan came all the way here, and what he saw were soldiers lying on the floor crookedly, these soldiers were very tired after a day of intense fighting, and many of them had fallen asleep after relaxing and lying down, and even snored.

As soon as Shen Yan walked in, Cheng Yanqiu greeted him as if he was waiting for him. Facing the other party's anxious eyes, Shen Yan understood what the other party wanted to say, and without waiting for the other party to speak, he directly took out five syringes with a surname from his pocket, and each syringe was full of a tube of blood-red "medicinal liquid". He handed the syringe to Cheng Yanqiu and said, "The conditions are limited and can't be sterilized, so let's use it!" By the way, one drop per person is enough! That's enough for everyone to inject! ”

Disinfect? According to Mira's words, "Master, your blood is the best anti-inflammatory, antidote, and external enhancer, so how can it be infected?" Therefore, Shen Yan is not worried about the use of one syringe by multiple people at all, even if those infected by the virus are cross-used with those who are not infected!

"Oh!" Cheng Yanqiu took the syringe, was stunned and speechless, turned around and walked towards the eleven wounded soldiers first!

When Zhang Shanshan saw Shen Yan come in, the whole person seemed to see a mouse and a cat, and she was about to bow up, but Qi Lan quickly pulled him up, shook her head and whispered a few words, which made Zhang Shanshan sit down again. But from the way she looked at Shen Yan's side, anyone could see that she seemed to be very unhappy at the moment!

Shen Yan didn't pay attention to Zhang Shanshan's actions at all, but walked directly to the three experts. At this moment, the three biological experts who had just been safed were gathering together to discuss something in a whisper, each of them holding a stack of information in their hands, and they were talking about it from time to time!

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