"When you see that painting, don't you understand the truth? The ancient people used painting as history, recorded all the things that happened, and showed them to future generations, just to tell us that all the events in the world are the cycle of heavenly principles, which are endless. What we are pursuing is just another cycle of the ancients, and it is an unsolvable cycle, and we will never find the right answer. Mr. Yuan said.

Lin Xuan's feelings were so excited, but in his eyes, he didn't care at all, as if he had long been commonplace.

"Then what's the point of me living? If I can't find her, what is the meaning of my life? Lin Xuan's voice was hoarse, as if he was in the end of the world, all kinds of horror, frustration, depression, and mourning came up together, like one after another bathing towels soaked in seawater, covering him to death, almost suffocating to death.

He leaned his back against the pillar, and he couldn't see what Donna was doing on the screen, but he felt that his back was cold, and the distance from Donna was as far away as mountains and seas.

"Go and lie down on that stone bed." Mr. Hara pointed to the right.

"I don't want to lie down, I'm afraid that once I lie down, I won't be able to stand up again." Lin Xuan shook his head.

"At the end of the strong crossbow, you can't wear Lu Min. Lin Xuan, if you don't pay attention to maintaining your body, it is unknown whether you can survive or not, how can you rescue your friends? Mr. Hara smiled faintly.

That kind of smile can only be seen through the red dust and investigate the life and death of the world.

Anyone who knows Mr. Hara's life experience knows that he once fell in love with a famous Asian female spy and put all his feelings into it, but in the end, it turned into a picture cake and his dream came to nothing. It was the failure of his life, and since then he has been in a slump, and if it were not for the enlightenment and teachings of Luo Kai, the "Asian Eagle", and "that gentleman", there would be no such person as Mr. Yuan in the world.

"Okay, I'll go lie down, I'll lie down." Lin Xuan could barely control the feeling of the sky spinning in his head, but his legs kept shaking violently, as if he had just finished a full marathon.

He moved forward, and as soon as he reached the stone bed, he fell uncontrollably.

The stone bed was cold, from the skin to the heart, making every inch of his body tremble. Under normal circumstances, people will not be able to sleep because of the cold, just stiffen, using body temperature to fight the cold, but he is so tired, since he climbed Mount Everest, he has not slept peacefully for a night, but has been running around day and night, and his mood is as tired as his body. So, in a very uncomfortable state, he still fell asleep groggy.

As soon as he closed his eyes, he saw Donna, and saw the old submarine parked on the shore. It's just that Donna is still in the screen, and the two of them are separated by the screen, like centuries and several layers of reincarnation.

There is also a stone wall behind Donna, which means that Donna is also in a huge space inside a mountain.

There were paintings on the stone walls, which were petroglyphs with rough lines and dry tones, but Lin Xuan didn't care about looking at them, his gaze was firmly attracted by Tang Na.

"Is that Donna?" He muttered to himself, "Could that just be a reflection of my thoughts?" I think, therefore I am, and what comes to mind, is reflected on the screen. Actually, Donna is long gone, and what I see is just an illusion created by my mind? ”

He clutched his head in pain and squeezed his temples with his palms, trying in vain to squeeze out all the thoughts about Donna and calm his mind completely.

"I've seen two of the four stone pillars, what are the other two embedded in?" He remembered what had happened in the cave.

So, in his dream, he moved sideways to the third pillar. The screen suddenly lit up, and there was a picture of a raging fire. It was a real sea of fire, vast and boundless. It wasn't any ordinary fuel that supported the fire's burning, but churning and jumping blazing magma.

In geology, the temperature of magma has been described quite accurately. The magma that spills out of the earth's surface, like freshly baked molten steel, has been determined to have temperatures between 900 and 1200 degrees Celsius and up to 1300 degrees Celsius. In terms of detailed classification, in clear weather and good perspective, the relationship between the color of the lava flow and the corresponding temperature is roughly as follows: white, greater than or equal to 1150C; Golden yellow, greater than or equal to 1090c; Orange, greater than or equal to 900C; Cherry red, ≥ 700C; dark red, greater than or equal to 625C; Faintly visible red, 475C or more.

At this moment, in Lin Xuan's eyes, the tumbling magma was a golden yellow, mixed with dazzling white, which showed that it was already the limit of temperature. In super steelmaking furnaces in various countries, the temperature of molten steel in the liquid state fluctuates depending on the composition, and is roughly around 1600C. Therefore, what Lin Xuan saw at this moment was equivalent to boiling molten steel in a large steelmaking furnace.

Lin Xuan was convinced that most of the earth's materials could be melted by high-temperature molten steel, especially metals. Therefore, when he saw that there were countless huge pipes in that hot ocean, he couldn't help but have deep doubts about his eyes.

Those pipes plunged straight into the sea of fire, because there was nothing there to refer to, and Lin Xuan couldn't judge the diameter and material of the pipes.

"Oil wells? Gas wells? He could only explain the scene using earth knowledge.

When he moved to the fourth pillar, he immediately realized that the contents of the third and fourth pillars were continuous, because the screen embedded in the fourth pillar was a huge set of machines, and the bottom of the machinery was full of pipes, which on the surface were the same type of pipes in the sea of fire.

Lin Xuan intuitively knew that those horizontal and boundless machines were a group of huge steam engines, absorbing heat energy and converting it into kinetic energy and transporting it to other places.

The steam engine is a reciprocating power machine that converts the energy of steam into mechanical work, and its advent caused the industrial revolution in the 18th century, and until the beginning of the 20th century, it was still the most important prime mover in the world, and then gradually gave way to internal combustion engines and steam turbines, etc.

As we all know, the development of the steam engine is first reflected in the improvement of power and efficiency, which in turn depends mainly on the improvement of steam parameters. The initial vapor pressure was only 0.11 to 0.13 megapascals, at the beginning of the 19th century it reached 0.35 to 0.7 megapascals, and in the 20s of the 20th century it reached 6 to 10 megapascals. In terms of steam temperature, at the end of the 19th century it did not exceed 250C, and by the 30s of the 20th century it had reached 450 to 480C.

Lin Xuan couldn't help but sigh: "If 1600C high-temperature fuel is fed into a steam engine, what kind of power will it be converted into?" How many 10,000 times more efficient will it be? ”

According to the data, the total efficiency of the steam engine in continuous operation at the beginning of the watt period did not exceed 3% in terms of fuel calorific value; By 1840, the best condensing steam engines had a total efficiency of 8%; By the 20th century, the maximum efficiency of the steam engine could reach more than 20%. In terms of rotational speed, the Watt steam engine at the end of the 18th century was only 40 to 50 revolutions per minute; At the beginning of the 20th century, the speed reached 100 to 300 revolutions per minute, and some steam engines reached 2,500 revolutions per minute.

Correspondingly, in terms of power, the initial single engine had only a few horsepower, and a marine steam engine at the beginning of the 20th century could reach 25,000 horsepower.

If Lin Xuan guessed correctly, the power that this group of giant machines can produce will be a huge astronomical amount, which can drive any kind of working machine on the earth.

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