When Aoki exited Su Huilan's dream, the unconscious savage on the ground just woke up.

In fact, their time in the dream was short, at least to Alice, it was only a moment. She heard them say something inexplicable about who was in whose dreams, and she didn't dare to ask anything, just watched curiously.

Then, it was as if time had stopped, and for about two or three seconds, the cave fell silent, and even space seemed to freeze. Alice saw Aoki and Su Huilan staring at each other, motionless, like two wax figures. She felt a chill and quickly stood up and added some dead branches to the fire.

At this time, the wild man lying on the ground woke up, and his eyes were full of anger. He rolled over and grabbed Alice's feet, who were adding wood to the fire.

Alice screamed in fright, and just as she didn't know what to do, she heard a bang, and the wild man, who was about to get up, suddenly flew out, hit the stone wall of the cave, and rolled down again, and seemed to be unable to get up for a while.

She saw that the wax statue of Aoki had lifted one of his feet, and the paddle board on his foot was still dangling there.

Su Huilan came over and hugged the frightened Alice, kissed her cheek, and comforted: "It's okay, Alice, don't worry, it's safe here." ”

"I'm fine." Alice's lips were white, and her body was shivering.

The moment the wild man just held her feet and neck, the smell of wildness that exuded the smell of fox made her panic all of a sudden. She thought of Mrs. Larry, and her heart felt as if she had been tugged at, followed by anger and hatred.

She stared at the moaning wild man lying on the ground, and fire was about to rise in her eyes.

Su Huilan felt the tremor of Alice's body, which was anger from the bottom of her heart. "Go ahead," she encouraged. ”

Alice, with a tense face, walked over and kicked the wild man hard, scolding, "Beast! Brute! ”

The wild man on the ground got up and, like a trapped beast, pounced on Alice fiercely.

There was another bang, and the wild man flew out and hit the wall, rolling down.

At some point, Aoki was already in front of Alice. His right foot was raised, and the paddle dangled from his foot.

The kick was heavier than the one, and the wild man struggled twice, spitting blood all over the ground.

Alice's courage grew, and she walked over and kicked the wild man in the crotch. The wild man had already been badly injured, but this time he was even more dead, and he grinned in pain, but he had no power to resist.

Alice's face became hideous, kicking and punching, and jumping up again, scratching the face of the wild man desperately with her nails, and screaming hysterically in her mouth, but she could not make out what was being called.

The wild man was scratched and bruised by her, and his face and chest were covered in blood. His eyes changed from anger and unwillingness at the beginning, and slowly turned into fear.

Alice's state was close to madness, and even Aoki felt cold when he saw it. He glanced at Su Huilan: "Almost, don't kill people." ”

Su Huilan went up and pulled Alice but didn't pull it away, and Alice was still scratching and tearing wildly, even biting with her mouth, as if she wanted to take revenge on the wild man for all the suffering that Lady Larry had suffered.

Su Huilan had no choice but to hug her and kept saying in her ear: "Alice! Alice! Stop, Alice! We can't kill him, he's still useful, and we have to save Anderson! ”

Alice stopped when she heard Anderson's name and sat on the ground stunned for a long time. She turned around, glanced at Anderson, and then threw herself into Su Huilan's arms and cried.

The wild man is still alive, Alice did not cause substantial damage to him, the real serious injuries are the few kicks that Aoki gave him, it seems that there are a lot of broken bones.

When Alice's mood calmed down, Aoki and Su Huilan began to work on how to hypnotize the wild man.

The island's natural spiritual force field still exists, but after a long day here, Aoki was surprised to find that he had become very accustomed to the existence of this energy field, just like people in Tibetan areas who would get drunk and itchy when they first left the plateau, but after only a few days, they would get used to the oxygen-rich air of the plains.

Su Huilan obviously felt the same way, she said: "The reason why hypnosis is ineffective for islanders is that they are adapted to the strong mental force field on the island, and their consciousness is not sensitive to the interference of mental power, just like bacteria tolerate drugs, and penicillin will not work if you inject too much." Although it is not yet certain whether the spiritual position on the island and our spiritual power are the same thing, I think that the essence is the same, at most the difference between ampicillin and amoxicillin. When they tolerate ampicillin, we naturally don't respond to amoxicillin. ”

Although Aoki felt that there was something wrong with Su Huilan's metaphor, such as the principle of mental power and antibiotics was completely different and there was no comparison, he understood what Su Huilan wanted to express, and admitted that the current predicament was indeed the case. If this problem is not solved, with the two of them, plus the helpless Alice and the injured Anderson, even if the crow returns, Petru and Ran will be fine, and they may not be able to get out of danger, let alone rescue Lady Larry.

He felt the ubiquitous spiritual force field, thought for a while, and said:

"You said this is an enclosed space surrounded by water, didn't you?"

Su Huilan said: "It's not surrounded by water, it's a ...... Klein bottles. ”

"Klein bottles?" Aoki remembered that Professor Mei had mentioned it.

"It was discovered in 1882 by the famous mathematician Felix Klein." Su Huilan explained, "You can imagine a bottle – a vase, a wine bottle or something, any bottle, as long as it is a normal bottle with a bottom and a mouth. Dig a hole in the bottom of the bottle, then extend the neck of the bottle, imagine the neck of the bottle as soft as a water pipe, bend it, and insert the mouth of the bottle from anywhere inside the bottle, and then connect it to the hole at the bottom. This completes a Klein bottle.

Imagine the bottle, the mouth and the bottom of the bottle are connected, so it is closed. But from any point on the bottle, it can reach any point on the inner and outer surfaces of the bottle. That is, there is no distinction between inside and outside. A closed bottle, but there is no distinction between inside and outside. Put a bug in this bottle and it can easily crawl out without having to go through the wall

Of course, the Klein bottle is actually a surface that can only be truly represented in a four-dimensional space. I just described it from a three-dimensional perspective, and Klein also described it from a three-dimensional perspective, but what he really described was a four-dimensional thing. In three-dimensional space, its bottleneck needs to pass through the surface of the bottle to enter the inside of the bottle, that is, the position in the three-dimensional space occupied by the bottle itself is occupied by another part of itself.

But if there is another dimension, it does not need to pass through its own body, but through the fourth dimension, it connects the mouth of the bottle to the bottom of the bottle. But we need to express it in the three-dimensional space of our lives, so we have to make it look like we intersect with ourselves. ”

"You're saying the island is a Klein bottle?" Aoki asked.

Su Huilan opened her arms and made an upward movement, saying:

"The sea outside the island looks like a flat surface, but it's actually a distorted space, which you can understand as being rolled upwards, like the body of a bottle. The island is the bottom of the bottle, and the lake on the island is the hole dug in the bottom of the bottle. The bottle made of the ocean slowly closes into a bottleneck in the sky, passing through the fourth dimension and connecting to the hole at the bottom of the bottle, which is the lake on the island. This makes up a complete Klein bottle.

This is also the reason why Alice and they will return to the lake when they go to sea, in the Klein bottle, the inside and outside are connected, it is a kind of non-directional plane, and the key is the hole at the bottom of the bottle, which is the lake on the island, which is the bottom of the bottle and the mouth of the bottle. ”