But I know that this sound wave is something that Hebo can't get close to, it's his lifeline, from the point of view of time, if Genghis Khan wants to use it on the battlefield, then before he has time to use it, people are already not good, so they can only hide underground, this is a sharp weapon, there is no time to use a sharp weapon, think about it, on the battlefield, there are countless invisible people wantonly wielding, coming and gone, going without a trace, in the era of cold ice, this is the most powerful weapon. （）

Everyone also felt lucky, glad that he finally died before using it, if there is such a thing in the world, then there is no need to open the jade disk, and this day can be changed.

The Bu brothers finally came, and with them came a mysterious box, in their words, if it weren't for the fact that the box would have been cleared, they would have made the time to come over a little shorter, so short that it was just a lunch time.

Step by step urged to go to the scene, this time, the equipment is sufficient, in order to prevent those hamsters from running out to make trouble again, Wei Qing used his connections in Mongolia, and laid down civil air defense near the mausoleum, and they applied for a short-term postgraduate examination time in the name of archaeology through Professor Xu, this place is a hot potato, for Professor Xu's request, the relevant parties agreed almost without any hesitation, in fact, they believe that the mausoleum is a forbidden land, they can protect themselves without any protection. （）

I don't know how to judge their thoughts, but this cemetery is indeed an abyss, even if they visit three times, the unknown area still does not dare to enter, only in the known area activities, it seems that the power of Gu poison is indeed strong, this unknown fear makes the hamsters not return, the group of dragons has no leader, it is also one of the reasons.

The Bu brothers took the box down, it turned out that the box was used for the collection of sound wave data, as long as the data was collected, the sound wave could be copied, this is the theory of the Bu brothers, Bai Yi and Tang Sancheng, and the Seven Evil Bubu protected the two, and the rest of the people waited on it, and the three of them knew that the brothers were also uncontrollable people, and if they had too many hands and feet, they would cause some trouble if they didn't get it right.

Fortunately, the two brothers were completely attracted by the sound waves hidden in the wall, and the two of them put on protective earmuffs, so they unscrupulously put their ears on them and listened, and Bu Yiban and Bu Yifan looked at each other: "Oh, it's a great sound wave, if you listen to it for a long time, it will not only puncture the eardrum, but also make the heart burst, have you heard of it, you can use sound waves to kill people?" “

"You mean infrasound, sound waves with a frequency of less than 20 hertz are called infrasound. Infrasound waves are not easily attenuated and are not easily absorbed by water and air. Infrasound waves tend to have very long wavelengths, so they can diffract around certain large obstacles. Some infrasound waves can circle the Earth for 2 to 3 cycles. Due to the similarity of the vibration frequency of certain frequencies to human organs, infrasound waves are easy to resonate with human organs, which is very harmful to the human body. Bai Yi said: Therefore, as long as this vibration frequency is mastered, it is not impossible to use sound waves to kill people.

Tang Sancheng immediately looked at Bai Yi with adoring eyes: "You know so much. “

"It's that you know too little." Bai Yi said.

"Well, so sonic waves are actually a pretty amazing thing." Bu Yifan said: "It's really curious, how did people in ancient times know how to use sound waves, the wisdom of human beings is really endless." “

"Alright, here we go." Wei Yiban had placed one of the rituals in the box on the wall, and he had been adjusting the basic data on it, and now, his hands carefully left the machine: "Now you can start collecting data." （）“

Everyone's eyes were focused on the machine on the wall, the red light of the machine turned on, and it made a sound similar to "Di Di" telegram, and then the bands on the display began to change, they were extremely fast, looking at the track of this sound wave, Bu Yifan and Bu Yiban glanced at each other, and said in unison: "This kind of sound wave can not only kill, but also collapse here!" “

"How are these sound waves enclosed in the wall?" Bai Yi is most concerned about this issue.

The Bujia brothers glanced at each other, and shook their heads in unison: "I don't know yet, but we'll take a picture and go back to do a simulation test to see what the final result is." “

Bu Yifan suddenly sighed: "It's a pity, can't we smash this wall and take a look?" “

Bai Yi was sweating at the waterfall: "Don't come nonsense, if this place collapses, you know what will happen to us, right?" Even if we ran at top speed, we couldn't get to the exit before we collapsed. “

Bu Yifan stuck out his tongue: "Then forget it." “

The process of collecting sound waves was not long, and compared to the long preparations, it was inevitably too short, so Tang Sancheng let out a regretful voice: "It's so fast? “

"Then how long do you want, even if I let it work for a day, all we want is this one wavelength, this one frequency will do." Step 1 said.

It seemed that he had offended the two brothers, and Tang Sancheng immediately said, "I was wrong. “

The Bujia brothers accepted it so confidently, and Xiaoshan smiled: "Brother Sancheng, never doubt the authority of professionals." “

"We'll learn the lesson later." Tang Sancheng said with a wry smile, no matter how long he lived, the things of the world and human feelings did not seem to be within the scope of his study, although he would twitch once in a while, but he would always not last.

After packing up these instruments, the five of them went up, Wei Qing and Cong Yang came over and answered: "Are you okay?" “

"I didn't go to other unfamiliar places, so it's fine." Bai Yi said: "With this, I won't have any curiosity about this place in the future." “

"Uncle Wei." Bu Yiban and Bu Yifan proudly raised the box in their hands: "Everything is here." “

"Okay, I'll ask you more when I go back." Wei Qing said.

After collecting the sound waves, on the way back, Tang Sancheng poked his head out to look at the underground mausoleum, and clearly saw nothing, but Tang Sancheng was very emotional: "I'm really curious about the story between Genghis Khan and Hebo, maybe this is the last time we come here." “

"I hope I'll never come." Bai Yi said in a deep voice.

"If the sound wave is useful, we don't have to run around to find any ancient artifacts, I'm afraid we will have to face up to Hebo." Wei Qing said: "Do you remember that contract? We're already challenging him now, we've hid the Yakshas, cut off his back, and now we're attacking again, will he always let us do whatever we want? “

"I'm afraid the day of a head-to-head showdown is coming." The Seven Evils said, that's it, so, remember the evils, let's not recognize each other well now.

"The Bujia brothers don't know the inside story of Hebo, and I'm afraid you will have to take the responsibility of protecting them, before the sound wave is copied and used." Wei Qing said heavily.

No one said anything, and Tang Sancheng suddenly felt that the burden on his shoulders was a lot heavier: "I know." “

Only people with Taoism can afford to deal with Hebo, and their shoulders, whether they can bear it or not, must be let out.

Yiyi came to the airport unexpectedly, and Wudong came with her, but Professor Xu disappeared, and he who accepted Wei Yi's mood, I'm afraid it will take a while to digest it.

Yixie and Wudong stood together, very close, it seems that the relationship between the two has made great progress, and the Seven Evils feel relieved, in the future, in addition to Nuria, there will be one more person who can take care of her.

"Thank you." Wu Dong said sincerely: "Thanks to you, I and Yi Xie have a chance to be reborn, and in the future, we will definitely not be reckless anymore, and we will live a good life." “

(Education 123 Literature Network)