"Is the underground of the orphanage so big? We have walked for so long and we haven't reached the end yet..." Professor Xia sighed.

He suddenly thought of a very common phenomenon, "Could it be that... we are trying to break a wall?"

"No, although we have walked for a long time, the surrounding environment is also changing, and we have not returned to the original path." Xiao Du said methodically, "However, I just discovered that the path we walked may be an ellipse. .”

Professor Xia glanced at him in surprise. In such a strange environment, Xiao Du could actually see the difference in the path?

Moreover, there were no landmarks in the entire underground. They were all the same concrete roads and walls. How could he see that the environment was changing?

Could he still tell the difference between the bricks on the walls on both sides?

But Professor Xia changed his mind and felt that Xiao Du was wrong.

He stopped and asked suspiciously: "Ring? Why don't I feel it? Aren't we walking in a straight line?"

Chu Yao said: "It's because the declination of the road is very small and long enough, so I can't feel it."

"So, if we continue to move forward, won't we still return to the starting point?" Professor Xia continued.

Xiao Du shook his head and said: "No, the place where we started from the beginning only leads to the road in front of us, which means that this elliptical ring is not closed."

An unclosed circle must have a starting point and an end point, and the two points will not overlap.

However, they have to work harder and go around in a big circle to find the door leading to the F1 floor.

After hearing Xiao Du's guess, Zhou Weiqi also had an idea: "Is there a possibility that we are declining?"

They are used to thinking that they can only go to the next floor by taking the elevator.

But if the terrain of this parking lot continues to decline, like a long inclined ladder, wouldn't it be possible to reach the F1 floor directly?

"Whether it is or not, we just keep moving forward. There is no fork in the road here." Ling Feng said bluntly.

What he said was unfortunate. After a few minutes, they saw the first fork in the road.

They are two identical passages. When you shine a flashlight into them, you can't see where the boundary is. They are like two bottomless caves.

Zhou Weiqi scratched the back of his head. Although he wanted to complain about the director's crow mouth, he still did not say it due to his majesty.

He stopped and suggested, "What should we do? Let's split up?"

"No!" Professor Xia was the first to deny his idea, "Not to mention that there are only five of us, there is no signal at all underground, how will we contact you then? Who knows if there will be more forks inside, When the time comes, people will become more and more scattered, which will be detrimental to us!"

Ling Feng neither agreed nor objected. He looked at Xiao Du and asked calmly: "Xiao Du, what do you think? Is there any difference between these two forks?"

"Yes, can Xiao Du tell which way is the right way?" Professor Xia also looked at him expectantly.

Xiao Du walked to the intersection on both sides. He observed it for a long time and said with a sense of disappointment: "If one of the roads is correct, then it must have more obvious human traces. Unfortunately, the road that crosses these two roads Everyone is pretty much the same.”

"What do you mean? Are both of them wrong?" Professor Xia was extremely confused.

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