"Parallel reflection rays?" Nangong Yu asked puzzledly, for people in this era, it is too troublesome to explain to them what specular reflection is and what scattering is, and there is not so much time now, so Ruan Yanluo tried to say simply: "The smoother the place, the reflected light is in one direction, so that the more light is reflected in our eyes, and we look brighter, and on the contrary, if these places are not smooth enough, but very rough, just like the rock wall over there......"

Ruan Yanluo pointed to the hole that looked darker and said, "Because there are depressions on it, the light is reflected in all directions, and there is less light reflected in the eyes, and we look darker." And people are phototaxis, which means that if there is a bright place and a dark place in front of you, you will subconsciously and unconsciously walk towards the bright side......"

Although I still couldn't understand some of the terms in it, I understood another thing, Nangong Yu patted her thigh and said, "It turns out that that woman used this method to interfere with our choice!" It's a bit too clever. ”

Ruan Yanluo nodded in agreement with Nangong Yu's statement, and seeing that the others were still a little confused, he explained: "Every time we subconsciously choose to go to the holes that look brighter, but in fact, these holes that look brighter are made into a loop by her, if we can't find this, then we will be trapped here forever, and we will walk too many times, and it is impossible to even want to exit the same way." ”

"But what if we happen to choose the dark hole?" Yan Ming asked with a sigh, this is possible, although people have phototaxis, but this choice is random, they are likely to pick a darker hole to walk.

"That's fine." Ruan Yanluo said: "Do you remember how many of these doubles we saw along the way? ”

Yan Ming recalled the marks he had made and said, "There are thirty-four." ”

"That's right, there are thirty-four double openings that don't repeat themselves, and even if we coincidentally choose the dark ones in some of the caves, it is still possible to choose the bright ones in other openings due to phototaxis, and as long as we go to the wrong one, I guess, we won't be able to get out of this tunnel maze at all. It's the use of quantity to compensate for chance. ”

After Ruan Yanluo explained, everyone understood, and for a while, they couldn't help but gasp.

It's really dangerous enough, if it weren't for Ruan Yanluo who happened to know, then they might really have to sacrifice collectively in such a small cave this time.

One of the guards said adoringly, "Princess, you know a lot. ”

Ruan Yanluo was stunned, her face turned red, what did she understand? It's just the accumulation of two thousand years of culture more than them, and the accumulation of hundreds of millions of people in the long river of history, to paraphrase Newton's words, she is standing on the shoulders of giants.

"No, I just happen to know." Ruan Yanluo squeaked and said, she can't summon everyone in the world, she is actually a monster from another time and space.

This look fell on the eyes of those who didn't know the truth, and it immediately became a proof of Ruan Yanluo's modesty, and his admiration for Ruan Yanluo deepened.

Ruan Yanluo's face flushed, she really couldn't stand this kind of worship, it felt like a swagger.

Nangong Ling was happy when he saw that his princess was holding back, and leaned over and asked softly, "You are also embarrassed?" ”

Ruan Yanluo glared at Nangong Ling fiercely, and said in a low voice, "Go aside." ”

Nangong Ling couldn't help laughing, grabbed Ruan Yanluo's head and threw it into his arms, and rubbed her hair vigorously with his big hands.

"Hey, hey, show your affection and show it later, now that you know the principle, let's talk about how to get out first!"

Dozens of pairs of eyes looked at Ruan Yanluo in unison, this flaw was seen by Ruan Yanluo, and naturally he had to ask her for a way to get out.

Before Ruan Yanluo could speak, Nangong Yu on the side snorted: "I said that you are all elm heads?" Since the bright place is a trap, then we just need to choose the dark one every time. You are all trained badly by the third child, all of them are muscular and simple-minded, and if you don't use this annoyance, you will become a pig's brain. ”

The people in the whole world who dare to say this about Lord Ling's secret guard are estimated to be Nangong Yu.

Receiving Nangong Yu's provocative gaze, Nangong Ling's expression was very calm, and he said slowly: "This batch is the batch you trained." ”

Nangong Yu choked on a mouthful of saliva in her throat, almost choked herself to death, coughed and stared at Nangong Ling with red eyes, her eyes were watery, as if she was about to cry when she was bullied by Nangong Ling.

Ruan Yanluo was happy on the side, no wonder this second brother always looked bitter and sad about her family Ah Ling, and she could only be crushed if she dared to love.

Thinking about it, I laughed even more cheerfully.

But laughing and laughing, the second prince's brain is really not an elm head, and the method he just said is exactly what Ruan Yanluo wants to say.

The group rested for a while, set off again, and chose the road according to the method Nangong Yu said, and after about half an hour, their eyes suddenly lit up, and they really walked out.

Everyone breathed a long sigh of relief, but the next second, they were stunned, because they were facing an ocean of waterways in front of them.

In the passage on the other side, Wei Liu and his party were much luckier than Nangong Ling, there were no holes here, only a black corridor, and they didn't know what was painted on both sides of this corridor, it seemed to be absorbing light, Rao was that they took so many torches, but each torch could only illuminate a small area in front of them.

The pitch-black light made people's hearts extremely depressed, and Wei Liu and his party walked slowly, their nerves were tense to the fullest, ready to deal with the dangers that would arise at any time.

I don't know how many hours I walked in the dark, and the nerves were tense for a long time, and even this group of specially trained shadow guards was a little unbearable.

"Your Majesty, let's take a rest first." The leader of the shadow guards came over and said.

Wei Liu looked at everyone's tired faces and nodded, so the group found their own places and sat down against the wall to rest.

Wei Liu also sat down, he looked at the pitch black in front of him, and it seemed that he couldn't see the end, and there was an indescribable irritability in his heart, so he simply closed his eyes and stopped looking.

Anyway, it's dark when you open your eyes, it's dark when you close your eyes, it's the same whether you see it or not, so it's better to close it and recuperate.

I don't know how long I closed it, but when Wei Liu opened his eyes again, he suddenly found that it was dawn