"Cow, cow, ah!. Sun Wei's miserable screams echoed in the cave.

"Sun Wei, what's wrong with you!" I responded.

Then, he folded up the parchment map and put it in his pocket, then took a few more gold ingots, turned around and ran back a few steps. However, I was dumbfounded, I was lost, and the thousands of stone pillars and stone flowers just now looked exactly the same for a while.

I was a little panicked for a while, and kept shouting Sun Wei's name in the cave, but I couldn't hear Sun Wei's response now, and only my voice echoed in my ears.

"Why is this, can't Sun Wei hear my voice? Is he in danger?" I remembered what adults used to say that the cave was too deep and there was not enough oxygen, and it was easy for people to faint, and the more I thought about it, the more scared I became.

I tried to suppress the fear in my heart, but the more I tried to calm down, the faster my heart beated. I simply sat down on the floor and meditated.

I don't know how long it took me to be taken into that unknown world of nothingness!

"Master!" I shouted.

No response.

"Master Danyangzi, Master..." I called for help weakly.

It's still silent.

When I gave up in despair, I felt a faint but clear voice in my ears.

I seemed to have grasped a lifesaver, held my breath, mobilized all the cells in my body, and listened to the sound.

"Is this my tinnitus?" I listened to the sound of the Yellow River, but I didn't know why.

"It's the sound of blood flowing inside the cochlea. ”

In my ears, Danyangzi's voice came.

"Master. "I was overjoyed.

"You continue to feel the inner hearing. Danyoko interrupted me to ask a question.

Although I didn't know what internal listening was, I didn't dare to slack off in the slightest, and I gathered my strength to listen again.

"Listening is the sound of qi and blood flowing that you hear through self-cultivation, and the practice of listening is to use mental power as energy so that your ears can hear similar flowing sounds. Danyoko said.

I silently felt and understood the meaning of internal listening.

There are two nests above the human jaw, called "Tianchi Acupoint", which leads to mud pills, and is most prone to leakage and air. Therefore, it must be blocked when practicing, like a baby's breasts. In vain, the tongue is on the top of the jaw. Danyangzi pointed.

I quickly curled my tongue back against the underside of the tip of my tongue.

Danyangzi Wei Ran read: "Deep breath to attract qi to sink in the dantian, and then gather the mind to guide the divine thoughts to also return to the dantian, and at the same time pull the essence of the essence from the bottom of the sea to rise into the sea of qi, the three are fused into a mixed element essence and rotated into a round ball and then compressed to the appropriate size, the small ball goes backwards in the life gate to rise to the center, the spiritual platform, the divine path and then to the Tao Dao, and then the divine thought is divided into two, respectively to the shoulders of Yu, skylight, Tianrong, cheek car, Zheng, listening, Listen to the palace, then enter the cochlea, continue to travel inward to the center to keep the number of ninety-nine, continue to follow the Ren vein down the abdominal dantian to adjust the good mental power and continue to guide back and forth. ”

The qi has been flowing for a long time, becoming natural, even if you don't need to lead it, the breath has returned to the dantian, as if it has been forcefully attracted, and the qi has been passed. At this time, I only keep the slight intention in the dantian, still the dantian breathing, spit only fine, accept only lasting, if there is a death, there seems to be nothing, it is the true breath.

I felt it, "Master, I feel it. ”

"Zhuangzi" cloud: "Do not listen to the ear, but listen to the heart, and listen to the qi." This is the "Zhuangzi Listening to the Breath Method". Ask both ears to listen to their breathing. The breath is silent, so the listener is seeking a source of absolute profit and concentrating on nourishing qi. However, with internal listening, you can perceive faint sounds from the outside. I said what I learned.

Danyangzi twisted his beard slightly, and said: "Cultivate to a certain time to reach the primary stage, and then gradually listen to other parts of the ear, generally need to practice other meridians or cooperate with the Great Zhou Tian practice, the meridians of other parts of the body are not smooth, otherwise it will stop at the first stage, the third stage is the simplest quiet listening sound from near to far, choosing a sound source with small changes in law, such as listening to the sound of mountain springs and rivers, and slowly increasing the distance away from the sound source." ”

I continued to cultivate, and a voice came into my cochlea, "Niuzi... Help me. ”

I woke up immediately, my eyes opened, something happened to Sun Wei?! In the panic, I was a little overwhelmed.

Suddenly, I saw a bat flying in the cave, and I was really startled.

"Bats...", all I thought.

"Bats make high-pitched calls and use their sensitive ears to collect echoes from their surroundings. The echo tells the location and size of objects near the bat, as well as whether the object is moving. It can help bats find their way in the dark and catch prey. As I thought, a term pops into my mind. "Echolocation!"

This reminds me of a piece of news, "There is a boy abroad who has been blind from retinal cancer in both eyes since he was a child. But he has a special ability to emit a series of ultrasound-like streams of sound from his tongue, which produce echoes that only he can hear when they hit an object: if the echo is soft, it means that there is a metal object in front of it; If the echo is strong, it means that there are trees in front of you; If the echo is sharp, it means that the front is glass. By how loud and weak the echo is, you can also mentally measure the distance of an object from yourself.

Then, I giggled again, I'm not a bat, I can't emit ultrasound, how can echolocation?

I couldn't help but sigh. Grabbing a slender wooden stick, he knocked on the ground with remorse.

"Dada. ”

The echo of tapping on the ground actually drew a map in my mind, clearly showing the location of obstacles such as stone pillars, like a 360-degree panoramic vision.

I was really shocked, could it be that my ears have a supernatural ability, too?

I think back to the acoustics taught by my physics teacher in high school, "When sound is projected onto a large area at some distance from the sound source, part of the sound energy is absorbed, and the other part of the sound energy is reflected back..."

But I gave up after a while, because I love literature, and I scoff at those theories that have learned mathematics, physics and chemistry all over the world, and my academic performance is naturally not very good.

I tapped blindly on the ground, and the topographical map in my mind became clearer and clearer, but I couldn't tell the way back.

I was a little overwhelmed and put my hands in my pockets.

"What is this?" I pulled out of my pocket.

"Oh, that parchment map. I raised my eyes slightly.

However, when I saw what was in the picture, I understood that this was the map of this cave.

I was overjoyed, and after careful analysis, this cave should be the place where we first found the two-headed snake, and Sun Wei should be here, these marks... It should be the inflection point, then this circle is... What the?