"We've gone around twice? This can't be, we've been walking in a straight line, how can we be going in circles!! The cousin immediately retorted.

"That's because the space and time, and the darkness of the environment limit your sense of direction, in this pitch darkness, are you really sure that you have been walking straight ahead?" Zhang Qiuhan asked lightly.

"This ......" The cousin was stunned for a moment, she really couldn't be sure that she had been walking straight forward, but she couldn't admit defeat so easily, she quickly retorted, "Then what evidence do you have that we are going in circles?" ”

"There is no need for evidence, a curve can deceive the old man's feelings, and the old man knows from the time he takes the first step that this passage is a circle!" Zhang Qiuhan said lightly, "Of course, if you really don't believe it, you can also touch this wall, if your hands are sharp, you can also touch it, this wall is not absolutely straight and flat!" ”

My cousin did touch it, but she couldn't tell if the wall was straight or not. She originally felt that there was nothing wrong with this wall, but after Zhang Qiuhan said it, she suddenly seemed to feel that this wall seemed to be a little bent, but it didn't seem to be.

"Damn, this guy can't even get my senses right out of the way!" The cousin scolded in her heart, and then said unwillingly, "Okay, even if this is really a circle, then how do you explain that it did take me an hour to get out of the circle before?" Also, even if this is really a circle, what can we do but keep moving forward? ”

"Of course there is another way!" Zhang Qiuhan's quick answer made his cousin stunned for a moment, and then he heard Zhang Qiuhan continue: "Do you know why, every time you walk for an hour, you must be able to leave this circular passage?" ”

"Because...... Because...... Because it's meant to be a straight line! The cousin struggled for a long time before giving an answer.

"No, because not only are we moving, but the circular passage itself is moving!" Zhang Qiuhan took a few steps forward gently, and when he was about to hit his cousin in front, he suddenly stopped his steps, and said with great sighs, "What a ingenious design, the entire channel is designed as a clock, and we are designed as the second hand in the clock, when we walk 24 times in this channel, the whole channel will rotate 30 degrees, just to show the channel!" ”

"This is really a wonderful design, did our ancestors already have such a perfect mechanical design?"

"What are you talking about...... Why can't I understand at all......" The cousin was stunned.

Old Man Zhang didn't pay attention to his cousin's surprise, he closed his eyes, and at the same time chanted a word in his mouth, "If it is a clock, then the whole passage is double-layered, and if you listen to it from the propagation of sound, the location of the passage, the sound must be different!" ”

So, as the old man Zhang Qiuhan walked, he began to knock on the surrounding walls continuously, listening to the sound produced by the tapping, and finally, when he heard a slightly crisp sound, the corners of Zhang Qiuhan's mouth finally showed a smile.

"Come on, Connor, just attack this position!" Zhang Qiuhan patted Connor's head, Connor nodded, and prepared to spray a mouthful of dragon flame at this wall.

"Hahaha, it's useless, old man, you can't play games and play confused, do you? This is the world of the game, not the real world. All the walls around here are invincible, and our attacks can't destroy them, and I experimented with this passage the first time I entered it! When my cousin saw Mr. Zhang's actions, she couldn't help laughing and laughing.

"Really?" Old Man Zhang didn't argue, at this time, Kangna's dragon flame had already sprayed on the wall, and the entire wall exploded instantly, and the smoke and dust covered the entire passage, and when all these black smoke dissipated, an extremely bright light shot straight in, illuminating the entire passage.

"Really...... It's really blasted off! Looking at the scene in front of her, my cousin muttered in disbelief, "This is impossible, these walls are walls that cannot be destroyed, I have done experiments, how can it be blasted open all of a sudden!" ”

"That's because you're not in the right place!" Old Man Zhang explained in a kind voice, "Actually, your previous experiment is not wrong, most of the walls here are invincible and cannot be destroyed, even gods can't do this!" ”

"But this doesn't mean that all walls are like this, the plan of this dungeon deliberately left such a small piece of wall that can be destroyed, this is a shortcut to enter the dungeon, if you can find the location of this wall, you can blow it up with a bang!" Zhang Qiuhan said with a smile.

"I see!" The cousin nodded, looked at Zhang Qiuhan's gaze, and couldn't help but feel a little more awe and respect. Zhang Qiuhan came here for the first time, but he discovered the mystery in just 5 minutes, and he has been here no less than ten times, but he has never had these, and the gap between the two can be imagined.

"But I'm not much worse than him, the two of us are both proficient, and in my major, I'm definitely better than him!" My cousin cheered herself up in her heart, and then strutted forward and took the lead in the new passage.

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"I didn't expect to see such a bright light just now, I thought I had come to the ground, and now it's still underground!" Seeing the scene in front of him, Hu Yuan said in shock.

What caused the illusion of Hu Yuan was that it came from the extremely bright oil lamps on the wall, each oil lamp was as bright as a 200-watt fluorescent lamp, and there would be such an oil lamp on the wall almost every 5 meters, and it was natural that the whole space was extremely bright.

"Hmph, this is the everlasting lamp that has been handed down from the very ancient times in our China, and the grease in it can burn for thousands of years without extinguishing it, my good brother, do you know what the grease in it is?" My cousin asked with a smile.

It's just that when this cousin asked Ling Huyuan, his eyes fell on Zhang Qiuhan's body, it seems that this question was asked to Zhang Qiuhan.

"I won't know...... Cousin, what kind of grease did you say this was made of...... Wait, you won't tell me it's a human ......" Ling Huyuan covered his mouth.

"What do you think! Can these pounds of oil on your body burn for thousands of years? The cousin glared at Ling Hu Yuan, and then said, "Legend has it that this is made of fish oil from the mermaid, but according to the current research, this oil should come from some kind of oil in the body of a deep-sea whale, you don't even know this, it's really a shame for our Linghu family!" ”

"Elder Zhang, you should have known this knowledge for a long time!" The cousin turned to Zhang Qiuhan and asked.

"The old man doesn't know!" Zhang Qiuhan shook his head very dryly and said, "The old man doesn't know what mermaids are, and he doesn't know what deep-sea whales are!" ”

"I see, hehe!" My cousin laughed, but before she could laugh a few more times, she saw Zhang Qiuhan walk to the side of the oil lamp, sniff the smell inside, and then said with great certainty, "In ancient times, there was a strong smell of Martian rock, and the chemical formula of this grease should be CH₅O₆(C₁₈H₃₇NO₃). CH₃ON₅(CH₆)CO₅₅=₄CH=CHCH₂CH=CH(CH₂)₇COOH......, well, this is a polymer compound, which must rely on a high-pressure environment on Mars to synthesize it, and I can't imagine that there are natural products, which is really amazing! It's a pity that this is in the game, otherwise you must take a sample and study it carefully! ”

"This old fellow...... It's a little scary......" Looking at Zhang Qiuhan who was talking to himself, my cousin couldn't help but tremble up and down. Even if he was pretending, this old man was able to recite such a complex chemical formula in one breath, which was terrifying!