Fangyuan draws a straight line, connects two points, and then marks the distance of one light year on the straight line: "Okay, let's assume that the distance between two points is one light year, that is, in this two-dimensional world, it takes one year to move from point a to point b at the speed of light."

After assuming it is finished.

Fang Yuan picked up the paper and folded it up so that points a and b overlapped, and then explained:

"Now after the paper is folded, point a and point b overlap, so what is the distance between these two points?"

"It's zero. This all overlaps." Beef balls naturally replied.

Fang Yuan glanced at Han Youwei and asked her to help answer.

Han Youwei explained: "The correct answer is that in the two-dimensional world, the distance between these two points is still one light year, but in the three-dimensional world, the distance between the two points is zero."

Ye Zheyu immediately understood and suddenly realized: "So that's the case, because the two-dimensional world only has x and y axis, and no z axis. Therefore, in the two-dimensional world, point a and point b are on the xy plane, and the distance is still one light year. But in the three-dimensional world, with the z axis, on the z axis, the distance between point a and point b is zero."

Fang Yuan then explained: "This is deducing the three-dimensional world from the two-dimensional world. We live in the three-dimensional world and cannot see the fourth dimension. Our three-dimensional world is like a piece of three-dimensional paper. The earth is point a, and the crack world is point b.

"Now, this piece of paper is a two-dimensional world, folded in the third dimension. What will happen if our three-dimensional world is folded in the fourth dimension?

"That's right, our three-dimensional world, folded in the fourth dimension, causes the earth and the fissure world to overlap like two points ab, and collide.

"Two three-dimensional worlds collided in the fourth dimension, thus creating space cracks."

This explanation explains the causes of space cracks through a piece of paper, which is very easy to understand.

"So that's how it is." Eve nodded after understanding.

"So, if you pass through the cracks of space, you can go to another three-dimensional world?" Beef balls began to imagine going to another world to explore.

"Yes, you can go to the world of star beasts, and once the space crack is closed, just like this piece of paper, it will be re-expanded, and the distance between the two points will become a light year. At that time, if you want to return to the earth, you can only dream." Fang Yuan replied.

Beef Ball then asked, "Fang Yuan, have you decided on the squad list?"

"not yet."

"You won't plan to change people, are you?"

"I haven't thought about it yet."

Fang Yuan said, thinking carefully for a moment, and said, "Before I decide the team list, you must consider whether you are really ready to participate. This actual crack battle is not an assessment, but a real crack war.

"I even suspect that the military may have predicted something huge crisis and need to cultivate powerful awakened people, so the military arranges practical assessments."

“What a huge crisis?”

"I don't know either. However, when I just explained the nature of space cracks, I thought of a possibility..."
Chapter completed!