I am the spirit teacher

Three to five minutes have passed. The members of the Wild Elf Management Bureau in the conference room have proposed and rejected plans one after another, and now they are all a little unmotivated.

At this moment, Captain Gong Shi opened the door and walked in, and brought a way to solve the siege of the city by the ultrasonic bats with minimal expenditure.

"Use ultrasonic waves?" The female team member who had previously proposed to let powerful trainers fight against the ultrasonic bats asked in confusion.

"What kind of method is this?" Another male team member didn't quite understand.

Only the female team member sitting at the edge, wearing a pair of glasses and with short shoulder-length hair, her eyes lit up:

"I understand! Captain Gong, this method will definitely work!"

"Ah? Fang Yan, what do you mean by this?"

When someone asked, Fang Yan stood up and explained:

"We are all trainers, and we have all learned about elves in the Elf Academy. I think everyone should know that elves like supersonic bats have no eyes. They rely on the reflection of the ultrasonic waves they emit when flying. The surrounding environment, for them, ultrasonic waves are equivalent to eyes that provide vision. Once we use ultrasonic waves to destroy the sound wave reflection state of the ultrasonic bat group..."

Fang Yan didn't say the next words, but everyone understood the meaning behind.

"Captain Gong! Just use this method!"

"Yes, Captain Gong, I think there is no more suitable plan than this."

Everyone agreed with the plan of using ultrasound and looked at Gong Shi eagerly.

Gong Shi met everyone's gaze and explained:

"I have already activated this plan, but I still need to prepare some things."

"What else do you need to prepare? We'll prepare right away!" Everyone was very interested. They couldn't wait to see the defeat of the supersonic bats.

"We also need a Hertz sound wave that is enough to cover, or has the same frequency as the ultrasonic wave emitted by the supersonic bat." Fang Yan said first.

Gong Shi nodded: "Fang Yan is right, we lack this condition now. But don't worry, the person who provided us with this solution has already started preparing to simulate the ultrasonic audio of the ultrasonic bat."

……

The training hall of Qiyue Elf Academy is open all day. In order to prevent the elves with instructors from suddenly evolving or needing to use the training equipment of the training hall, a training hall is specially kept open all day.

And this training hall happened to be a big help to Lin Xi.

"As expected of Anseong's number one training gym, it even has equipment to test the Hertz frequency of sound waves. Xiaoliu, get ready for the sound wave test!"

"Hey!"

Xiaoliu jumped out of Lin Xi's arms and stood in front of the radio that was testing the sound waves.

"The range of ultrasonic waves emitted by bats is between HZ and HZ. If you want to disrupt the ultrasonic waves of sonic bats on the basis of coverage, the best way is to also emit HZ ultrasonic waves..."

Lin Xi was startled when he thought of this, because although Xiaoliu has a very proud talent in sound waves, in the previous test of sonic moves, Xiaoliu could only test ultrasonic waves close to HZ, which directly doubled the HZ. If so, I don’t know if Xiaoliu will have an impact on itself when it is released.

"Forget it, Xiaoliu, let's test how many HZ ultrasonic waves you can produce first."

"Hey~"

Xiao Liu nodded obediently, and then at Lin Xi's signal, he started to use sonic attacks on the radio...

"HZ, HZ, HZ, HZ, HZ, HZ..."

The highest ultrasonic range that Xiaoliu can reach is 60HZ~HZ.

Lin Xi looked at the test form and praised:

"Unexpectedly, Xiaoliu, your sonic talent is so excellent. You are only HZ away from the highest HZ that the ultrasonic bat can achieve! Although this HZ is difficult to achieve, HZ's ultrasonic waves should also have some repelling effects. (Here I really can’t find the frequency of the sound waves that drive bats away, so I’ll write it like this for now. If anyone knows, please let me know in the comments...I will revise it then.)”

"Xiao Liu, use the highest HZ you can reach. Let's record a piece of audio. This audio must be stable. We will use it to drive away the supersonic bats surrounding the city."

"Hey!"

Xiaoliu knew his priorities clearly, so even when he was dragged to the training hall in the middle of the night, there was no expression of impatience on his face.

The audio recording went very smoothly, and it only took more than two minutes to complete it once.

Everyone at the Wild Elf Management Bureau also received the audio file from Lin Xi soon after.

Gong Shi clicked on the audio, but found that he couldn't hear anything.

Just when he thought the other party had made a mistake, Lin Xi sent another text message:

"This is HZ ultrasonic wave. Although it is still far away from the highest HZ sound wave of bats, it should be enough to disturb the activities of ultrasonic bats and drive them away. Oh, by the way, it is impossible to hear it with human hearing. It’s ultrasonic above HZ, so I didn’t send an empty file.”

Gong Shi after reading the text message:. . . . . .

Do you have super powers?Can you guess my thoughts over the phone?

"Yeah, okay, Mr. Lin, I understand, Mr. Lin, okay, okay, let's take action now."

Gong Shi hung up the phone, then looked at his team members and gave an order:

"Prepare the ultrasound equipment, record the audio file on your mobile phone, and start playing it throughout the city!"

"Yes!"

The team members looked stern, stood up from their chairs reflexively, and then took action quickly.

It has to be said that the Wild Elf Management Bureau, which has experienced many disasters, is still very fast and efficient in its actions.

In less than 10 minutes, they borrowed several ultrasonic equipment from the scientific research laboratory, and then carefully arranged these equipment in various areas of the city where ultrasonic bats gathered densely.

Then debug the equipment, input audio files, and select the HZ range.

By the time all these were ready, it was already late at night.

As the night continues to deepen, the mood of the supersonic bats surrounding Ancheng has gradually become violent. They are flying wildly in the air, as if they will rush into the city the next moment.

With his many years of experience, Gong Shi was obviously aware of this situation, so he immediately said:

"Get ready to play ultrasonic waves now! Get rid of all these ultrasonic bats surrounding the city!"

"Yes!"

The team members took the order and dispersed. They put on professional equipment and turned on the ultrasound.

"Om~"

The effects of ultrasonic waves, which are inaudible to human ears, were very obvious. As soon as they were turned on, the ultrasonic bats surrounding the city suddenly became panicked, and the sound of their wings flapping was very noisy.

Gong Shi stood on a tall building and turned on his flashlight at the place in the distance where the sound of wings was louder...

"Fuck!"

A mind-numbing number of ultrasonic bats gathered together, making people feel scared just by looking at them.