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First, a buzzing sound that came from nowhere suddenly sounded. The sound was light at first, but it was very clear in the quiet passage. In the blink of an eye, the sound became louder and louder, and the sound finally became one. Then, the wall directions of the front, back, left and right directions of the gate suddenly shot out extremely thin lights. The light condensed abnormally, like a large net that suddenly appeared, covering all the space in front of the door with a radius of more than ten meters in it...

"laser!"

Su Yichen and Wan Changchun exclaimed loudly at the same time, with extremely incredible expressions on their faces. As experts in physics, they are not unfamiliar with lasers, and can even be said to be extremely familiar with them, because in physics laboratories, artificial synthetic laser technology has been initially used, and in some relatively cutting-edge occasions or experiments, the use of lasers is an indispensable means.

In fact, the original Chinese name of laser was "laser" or "Lase", which is the transliteration of its English name LASER. It is an abbreviation word composed of one letter of each word in the English word Light Amplification by Stimulated Emission for Radiation. It means "expanded by stimulated radiation". The full English name of laser has fully expressed the main process of manufacturing lasers. The principle of laser was discovered by the famous American physicist Einstein as early as 1916. In 1964, according to the suggestion of the famous Chinese scientist Qian Xuesen, "light stimulated radiation" was renamed "laser".

In physics, lasers are called "the fastest knife", "the most accurate ruler" and "the brightest light". They are extremely widely used. According to the physical characteristics of lasers, the main applications include laser marking, laser welding, laser cutting, optical fiber communication, laser spectrum, laser ranging, laser radar, laser weapons, laser records, laser indicators, laser vision correction, laser beauty, laser scanning, laser mosquito killers, etc.

Nowadays, due to the limitations of my country's scientific and industrial technology, only a small part of these theories have been realized in actual application, and most of them are basically stuck in the application stage of laboratories and exploration. Even foreign countries are constantly exploring and developing the various uses of lasers.

Among these wide range of laser application technologies, the most noticeable one is of course a laser weapon. According to the characteristics of lasers, the photons of lasers are completely different from ordinary light sources, such as lights, etc. It is not as radiant as ordinary light sources, but has extremely strong convergence characteristics. All the photons of lasers gather in one center, just like countless people twist all the power together, which leads to the invincible and powerful power of lasers.

Because lasers are extremely powerful as weapons, they can not only cut any object in an instant, but also have extremely high temperatures generated by large energy. If they are shot by a large laser, even thick steel plates cannot withstand it, let alone an ordinary human body? Therefore, lasers have another terrible name, which is death light!

No one expected that the source of danger described in the last record would be laser. Judging from this overwhelming laser, Lin Jia was extremely careful when he tried to open the door. Otherwise, he would have been completely covered by the laser, and Lin Jia would have been completely evaporated in the blink of an eye. However, no matter how careful he was, he could not escape the speed of laser emission, because from the beginning of the change of the gate to the laser emission, only a few seconds were separated. Although Lin Jia reacted quickly and immediately retreated and fled, he was still injured by the peripheral laser due to lack of protection, which led to his final death.

Seeing the laser suddenly appear, Su Yichen and Wan Changchun were startled and then felt nervous. At this time, Hu Zhijun had already run to the curve quickly and finally avoided the laser coverage at the critical moment.

"Damn it, what the hell is this!"

The distance from the gate to the curve is not long, and it is only about ten meters long. However, Hu Zhijun almost used all his strength to this short ten meters away. When he leaned against the wall with a breath and turned his head, he could see the dazzling light of the laser on the wall on the curve, Hu Zhijun couldn't help but ask loudly.

"This is a laser." Wan Changchun replied with a dark face.

"Laser? What's this?"

Wan Changchun pursed his lips and gave him a serious expression to him, especially emphasizing the terribleness of laser weapons and the possible consequences of being shot. After listening to Wan Changchun's explanation, Hu Zhijun was so shocked that his eyes almost fell out, his face turned pale and his heart was still scared. At the same time, he secretly thanked that he was prepared. If he didn't run back as soon as possible, the result would be obvious. He was not beaten to ashes by the laser on the spot, or he died like Lin Jia.

The laser coverage and strafing in front of the door did not last too long, and it only lasted for about ten seconds. However, whether it was Su Yichen or Wan Changchun, they knew very well that in just a dozen seconds, the powerful power of the laser could not be stopped by anything, let alone escape from the coverage area.

After the laser disappeared without warning as if they appeared, the red light on the other side of the door gradually dimmed. After a while, Su Yichen and the others dared to look at it. At this time, they found that the door had returned to its original state, and there was no change in front of the door as before, as if everything that happened just now had never appeared.

Looking at the calming passage, the three of them couldn't help looking at each other, and everyone felt a sense of fear of escaping from birth.

Since we came to this place, whether it was the "Garden of Eden" or the passages we walked after, and even the mysterious squares and pyramids that Su Yichen had experienced, although there was an unsolved sense of mystery everywhere, they had never encountered any danger. Now, lasers as weapons appeared in front of them, and they were even almost killing Hu Zhijun.

"How could this be the case?" Among the three, Su Yichen was the most puzzled. Although the appearance of the laser shocked him, he was also very confused. It was obviously the same triangular mark, but why was he safe and sound when the pyramid was touched? Is there any difference between these two marks?

"Lao Hu, what are you thinking...?"

Su Yichen's heart was beating and beating. He held a handful of sweat in his hand and finally calmed himself down. No one expected that there would be such a danger. It seemed that the road ahead was blocked. Just as he was about to discuss with everyone what to do next, he looked up and saw Hu Zhijun looking at the door with a thoughtful expression.

"I'm thinking of a question." Hu Zhijun suddenly spoke, seeing Su Yichen and Wan Changchun looking at him in confusion, he reached out to point at the door: "Don't you find it strange? We have no danger along the way, including the grasslands and forests we have been to before. Even Professor Lin searched there for half a year but didn't encounter anything, but this...light......."

"Laser!" Su Yichen reminded softly.

Hu Zhijun nodded: "Yes, laser!" He thought for a while and continued: "Lao Wan, Xiao Su, you are experts, I don't understand scientific things. I am just a soldier, but our soldiers have the understanding of being a soldier. The Chairman once taught us that the more dangerous the place in the war, the more likely it is to be the core of the enemy, and the stronger the resistance of the opponent, which means that this is also the most important area of ​​the other party. For example, if two troops are fighting, as the battlefield commander, he will definitely set his command in the most reliable and safest place, and at the same time send heavy troops to protect it, because everyone knows that once the command is destroyed by the opponent, the result of this war will undoubtedly lose..."

Hearing this, Su Yichen and Wan Changchun reacted at the same time. Hu Zhijun meant that since all places are safe, there are such strict warning weapons here, can we also use reverse push to understand that this place is the most critical place? If this is not the case, there is no point in installing laser weapons here. As long as you find a way to open the door, all the mystery may be solved. Lin Jia's initial guess should be correct, and the way out must be behind the door.

But the question is, in the face of such powerful laser counterattack methods, what can the three of them open the door? When Su Yichen couldn't help but ask for this question, Hu Zhijun suddenly smiled and reached out to ask for the gun in Su Yichen's hand. Then, under Su Yichen and the others' eyes, he suddenly turned around and raised the gun, aimed at the door not far away and pulled the trigger without hesitation.

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Chapter completed!