As Muyama announces the retreat, Yuki and Hara Wenren continue to prepare for their next trip.

The original Wenren has no short-term goals recently. And the old-timer who did not want to be named has a high level and is willing to spend energy to teach others, so she plans to follow this old-timer in the near future.

And the next goal of the old-timers is to go south. Generally speaking, when knights go south in the New World, there are only two final destinations - Paradox City and this Paralympic Games.

If the old-timers' goals are really these two places, then as a chivalrous man, Yuan Wenren feels that he should also contribute.

Yuki, on the other hand, is staring at the 3D printer.

With an isotope battery to provide a steady source of energy, the 3D printer seized from the Z organization can finally work continuously. Sometimes, Yuki will also activate other equipment in the car. At that time, battery power was a little bit out of the way. But during this time period, Yuki will choose to temporarily turn off the 3D printer to let the equipment cool down and avoid over-operation and damage.

At this very moment, these 3D printers are rapidly repeating their work. They spray a layer of metal powder on the chassis, and lasers, magnetic fields, and ultrasonic waves immediately follow, the former heating up and the latter interfering with the growth of the crystals. After this layer cools down quickly, the machine will spray a second layer of metal powder, and so on, and in more than ten seconds, a batch of different types of metal parts will be baked.

Once one batch is complete, the 3D printer's internal magnetic field changes, bringing the parts together and sending them out of the protective gas-filled chamber through a specific outlet.

At the hatch, other robotic arms were already waiting. They quickly sort the parts and then carry out the initial assembly.

These robotic arms are also made by 3D printers.

At the beginning of the 21st century, Xiang Shan believed that 3D printing technology was likely to change the situation of the entire industry because as long as there were design drawings, a mature 3D printer could produce almost all types of appliances. As soon as the first assembly machine is assembled manually, production can continue continuously.

And the blueprint is just information. Downloading a design drawing without considering intellectual property rights involves the transfer of a few electrons – which requires very little energy.

Xiang Shan also doesn't remember whether he realized the ideals of his youth, but now, he does have a design plan in his head.

The size of these parts produced by 3D printers is very small, and when combined, it is only something about two or three centimeters in size.

"I don't know how to fight such a small thing......" Yuki muttered to herself.

"Huh?" Yuan Wenren glanced at it: "Ah, miniature worms. This is a means to confuse the enemy......"

Yuki was stunned: "No one would target these little robots, right?" Even with high-explosive bombs, it is difficult for them to hurt people. ”

He didn't know what a "bug" was. He hadn't seen a bug since he was a child, so he only said "little robot".

Yuki followed Xiang Shan to fight several times, although Xiang Shan never let him go to the front line in the real battle of life and death, but he also witnessed the battle between Xiang Shan and Green Forest several times. In addition, Xiang Shan will also give him some video replays of the battle.

He also had a general idea of the power of explosives. Aside from the "nuclear bomb" that Master talked about, there are very few explosives that can burst out with the energy to damage a fully prosthetic martial artist at this size. In order to prevent knights from obtaining radioactive elements, the government rarely uses nuclear bombs, let alone equips miniature nuclear weapons with drones.

In Yuki's mind, most of the things that can attract enemy fire should be obvious threatening targets like drones with a diameter of about one meter.

Yuan Wenren smiled: "Does that paper airplane look threatening?" ”

Yuan Wenren hadn't actually seen Xiang Shan use paper airplanes, but she was also there when Xiang Shan shared some combat experience, so Yuan Wenren knew that the "old-timers" were good at paper airplanes. In addition, the paper airplane method of warfare is also the method of assassination created by the legendary Wu Zu. Naturally, she gave an example.

Yuki pondered: "Paper airplanes are misjudging by radar...... This thing also has the same function? ”

The use of metal foil to jam radar is actually a very old tactic.

As early as World War II, when the United Kingdom was fighting against the Third Reich, the United Kingdom would let the planes throw a large amount of metal foil to form radar interference.

In more modern air combat, pilots rely on infrared jamming missiles filled with magnesium powder, nitrocellulose, PTFE and aluminum foil to break free from the lock-on of opposing missiles.

And the "paper airplane" is essentially a means to keep the metal foil in the air longer and move faster. This is to make the metal foil method more suitable for modern cyber martial arts.

The installation of a Lombard lens and an infrared emitting device on a paper airplane is also an extension of this tactic.

"In fact, paper airplanes can only be regarded as a 'stopgap measure'." Yuan Wenren sighed: "The performance of this thing is not as good as more advanced jamming methods, but it is better than simplicity and cheapness." It can also only interfere with radar, an instrument for active detection, so it can only be used in situations where it is difficult to play a role in vision. ”

Yuki said: "For example, Tiehua ......"

The original hearr held his forehead: "Indeed, such as Tiehua...... But I want to say that Tiehua is not a high-grade smoke bomb. This thing is not used very often in situations that interfere with vision. ”

Yuki was shocked.

Because he felt as if his master had been using this thing as a smoke bomb.

Hearing Yuki's doubts, the original hearer was silent for a moment.

"Probably because you haven't attacked a really heavily guarded base...... The kind with ground-based radar. The original Wenren said: "If it is only iron and metal foil, at close range, the radar is not impossible to burn through with great power." Don't doubt it, those eagles and dogs don't lack energy and don't care about resources. ”

Yuki feels challenged to the worldview he has built: "This ...... Isn't that how it was used? ”

"My seniors really liked it...... But actually......" Yuan Wenren thought for a moment: "The more common occasions are to refract lasers, destroy electronic components, and resist electromagnetic pulses. Occlusion communication and visual interference are both minor functions. ”

Speaking of this, the original Wenren suddenly realized that something was wrong.

If Tiehua spreads, in addition to affecting the enemy's communications, it will also affect the exertion of one's own internal strength, and will block the means of witnessing and other hacking in battle.

Therefore, the knights who are not very strong in internal strength will use this hand to make up for the shortcomings.

And the knights on the earth do rarely witness the targets of the government, because the king of Agni stays in the earth and moon system all the year round, if he hacks the target and has the authority to ask for help from the king of Agni, then the knight will almost definitely be killed by this strong man in the air.

However, the old-timers also used it a little too little. His habitual sprinkling of Tiehua means that in this person's habit, "exerting internal strength in fighting" does not belong to "common preferences".

But the level of internal strength of the old-timers is obviously very high. Judging by what he said, it was really high—at least that's what the original hearsay.

- So what kind of enemy were the old-timers fighting before?

The original hearer couldn't help but think.

“…… Sister Yuan? Yuki called.

"Huh?"

"You haven't answered me yet." Yuki said: "You say, these things are also used for interference? ”

Yuan Wenren nodded. She looked at the half-finished mechanical insects and said, "Little brother, you also know that there are many knights who will install radar in their bodies. Although in close ground warfare, radar waves are reflected by the ground background to generate clutter, but when a warrior takes off or moves at high speed relative to the ground, it is still easy to be locked by radar if the body is not specifically stealth. Moreover, with the support of excellent target filtering algorithms, warriors can also pick out suspicious targets from ground echoes for identification and tracking. ”

Yuki nodded: "Master has talked about a little, but it is not in-depth. ”

"Well, the seniors probably hope that you can start from scratch, first master the theoretical foundation, and then step by step, and avoid detours in martial arts cultivation." Yuan Wenren nodded: "You probably don't need this knowledge at this stage, but it doesn't hurt to talk about it." ”

Speaking of which, the original Wenren was a little envious.

Her master died at an early age in a raid by the government. In order to let her blend in with the crowd, the master did not hesitate to expose himself. Since then, the original Wenren has had to explore the textbooks and online materials left by the master on his own.

It's not an easy thing to do. At the beginning of the twenty-first century, one can find all the textbooks from elementary school to university on the Internet, but few people can learn these on their own. Is a person's thinking constructed, and it is still necessary for the teacher to guide him to form an overall understanding of the knowledge in the textbook.

For this reason, the original Wenren also took many detours. Her internal strength is now slightly weaker than Cui Lu, a young knight who has not yet graduated from the Red Stone Gate.

It is precisely because of this that she hopes to learn more from the old-timers.

Putting away these emotions, Yuan Wenren continued: "Therefore, many warriors, especially those with a prosthetic level sufficient to support high-intensity combat, often install radar warning devices in their bodies to detect the radar waves that irradiate them in time. In some cases, even the party using the radar has not yet discovered the target, and the irradiated party has already obtained the location information of the irradiator according to the signal characteristics of the radar wave. ”

"It's like playing a game of catching people in the dark when I was a child, and the first thing that can't control the glow is the first to be exposed. That's what it means, right? After Yuki finished speaking, he suddenly realized that those lives and memories were so long ago that they seemed to be from a previous life.

"Yes, yes, Senior Brother You, your understanding is very fast." Yuan Wenren didn't see Yuki's mood swings, and said to himself, "Therefore, although the duel between us long-range warriors often seems to be just a simple result of 'I shoot, the enemy falls', or 'both sides shot, one hit and one misses', but in fact, before the two sides shoot, they have long been fighting around radar detection and counter-detection. ”

It's a bit like the chivalrous stories of ancient times, where two heroes face off, often confront each other for a very long time, and then abruptly end the secret battle at the spiritual level, and the winner is separated by a sword.