The old cat suddenly laughed.

"That's right, a passerby who was about to go home to unclog the toilet was suddenly caught saving the world, what can he do?"

"If you give me a howitzer, then I can shoot the hell with the cannon." Tang Yue said, "It's a pity that I only have a toilet bowl in my hand." ”

"Then pull the out."

"What if it doesn't work?" Tang Yue asked.

"Then turn the leather upside down."

·

·

·

By the evening of the next day, the Martian stray dog malfunctioned for the first time.

This scarred and meritorious old dog finally can't hold on, its life runs through the entire Mars landing program, more than ten years of long years, stray dogs have always been the most effective assistant of the team, hard work, but it is also close to the age of retirement.

Its replacement has been designed, is a larger, more technologically advanced, faster, more endurance of the Mars rover, it is said that a single charge can run at a speed of 45 kilometers per hour for two hours, far from the Martian stray dog this walk-behind tractor can be compared, when the new car is in place, the stray dog this broken car will obviously be abandoned, everyone likes the new and hates the old.

Tang Yue once touched the wheel of a stray dog and said with emotion that the pioneers will eventually be buried by history, and who will remember this lonely old dog in a few years?

But the old cat said it was a good thing.

If the people of the future are still thinking about us, then it means that they are not looking ahead.

We have worked hard to pave the way for those who come after us, not for them to stand here and remember us.

"How's it going?"

The old cat sat in the cab and probed out and asked.

The person who found the fault was Tang Yue, the time was about to fall into the night, Tang Yue wanted to let the Martian stray dog move a little to a higher place, but as soon as he stepped on the accelerator, there was a slight abnormal sound under the body, and a person and a cat were alert, they did not dare to start the rover again, and immediately started maintenance.

Tang Yue squatted on the edge of the wheel of the rover, with the open access cover in front of him, and the open toolbox next to him, "Small fault, the transmission shaft is a little loose, just twist it, it's not a big problem, whether it's a person or a machine, it's full of problems at this age......"

Tang Yue knocked on the shell of the stray dog with a wrench, and then pulled the cable under the shell and glanced inside, as a mechanical engineer, it is his job to overhaul the stray dog on Mars, and no one is more familiar with this dog than him.

"Can it be fixed by tomorrow morning?" The old cat asked.

"No problem, I've checked it, and there shouldn't be any other failures in a short time." Tang Yue nodded, "But there is still a long way to go, I hope it can stick to its destination...... Dog, dog, whether we can get out of this desert alive or not depends on you, you must be reliable, and if you want to die, you will die until you have completed the task. ”

It's a pity that the dog won't speak.

Otherwise, it will definitely bite the man directly.

"In the future, we will have to avoid more difficult terrain, especially steep slopes and cliffs, as it stands...... The transmission wear is very serious, the stray dog's climbing ability is not good, and the ancient Great Wall you encountered last time when you went out of the gate, it is better not to appear on our way again. Tang Yue sat on the ground, "Otherwise, we'll have to get down and push the cart." ”

"Rest assured, the Great Wall is to the west of Kunlun Station." "And we've been going northeast, and we're going in the opposite direction, and it's impossible to meet it again." ”

"Who knows?" Tang Yue shrugged, "Maybe the group of ultra-ancient Martians who built the Great Wall actually built a siege city?" The Ihidi Plain was encompassed by a ring of walls - to defend against some of the largest foreign invaders. ”

"Less." The old cat said, "The Great Wall is formed naturally. ”

Tang Yue was stunned.

"Didn't it build it by an ultra-ancient Martian?"

"Of course not, there is a high probability that there has never been any intelligent civilization on Mars, it may have had life in the distant past, but it has not given birth to advanced intelligence, and the ancient Great Wall I encountered last time looked bizarre, but it was actually a miracle of nature." "After returning to Kunlun Station, I spent a long time analyzing the cause of its formation and using the workstation to simulate it, and the computer told us that the biggest possibility was geological activity and wind erosion. ”

"That's all?"

"That's all." The old cat nodded, "Most things in this world are actually not as bizarre as you think, and some things seem incredible at first glance, but in fact there are quite simple principles behind them. ”

"I compared the remote sensing analysis data of previous years, and found that the two sides of the Great Wall are different geology, it is actually the dividing line between two huge rock formations, the rock layers will be broken under the action of wind erosion and gravity, this is like the relationship between ice sheets and icebergs, and the low-lying areas will have water accumulation, and the ice crystals condensed by water at low temperatures will reduce friction, which makes the rocks easier to carry and accumulate, this process is very slow, but tens of millions of years can accumulate enough rocks to be buried by sand like city walls."

Tang Yue was a little disappointed.

The old cat is always like this, helping you explain the reasons behind the problem clearly, leaving no room for you to question.

If there is no questioning, there will naturally be no reverie.

Tang Yue once thought that Mars was a huge civilization relic, what a romantic fantasy, every inch of land he walked through, there were other intelligent creatures walking tens of millions of years ago, they built a magnificent wall, and there was no edge at a glance, then there would also be a huge and prosperous city, the road extends in all directions, extending to every corner of the world - although this great civilization has been completely left in time, but a glimpse of its ruins can also make people's hearts shocked, awe-inspiring.

But the results of the old cat's analysis pulled him back to reality.

There have never been any Martians.

There are also no walls and no cities.

There is no great civilization.

There are only rocks and sand.

"Can't you leave me a little room for imagination?"

"Stayed." "The simulation results are only 99.7% consistent with the actual situation, and your Martian civilization is in the remaining 0.3%." ”

"0.3 percent is enough." Tang Yue said, "Do you believe it? Such a high probability is enough to give birth to a Middle-earth world. ”

"Gandalf the Grey Wizard?"

"Yes, Gandalf the Grey Wizard."

Tang Yue casually pointed to the sand dunes in the distance.

"150 million years ago, in the distant Third Age, the gray-robed wizard Gandalf stood on that hill, raised his wand, looked west, and discovered the dark army of Sauron, and thus began a vast and tortuous epic."