"You must have heard of the moon development plan." The old man asked.

Roland nodded: "I have mentioned it in the news that I am preparing to build a small scientific research base on the moon."

"The previous lunar back landing and the manned moon landing plan that is now ready to be launched are all preparations for building a lunar base." The old man took a sip of warm water and said slowly: "We have prepared most of the links, and the rest is to complete them step by step and verify them. But there is a step-by-step gathering, and we have never felt confident."

Roland listened quietly.

"You also know that the material is one of the few shortcomings in our country." The old man sighed: "To build a base on the moon, at the beginning, of course, you have to transport the materials in several batches and then assemble them. Considering the relatively harsh vacuum environment on the moon and the transportation capacity of rockets, our building materials must be light enough, cold-resistant, heat-resistant, radiation-resistant, etc., and have sufficient hardness and toughness. There are almost no materials that meet these requirements at the same time. Even if we now infer that the few materials that can be used barely meet the standards in some characteristics and have shortcomings, either they are insufficient in radiation resistance or they are too heavy."

"I heard that the Bald Eagle also has plans for this. Their solution is to pre-mix the materials into glue, then move them onto a small 3D printer, and slowly print out the building. Of course, this is a revelation from the uncle party on the Internet, and I don't know whether it is true or not." Roland said.

"No matter whether it is true or false, this is of course a good method, but we don't have such material technology." The old man spread his hands and said helplessly: "And according to our calculations, the moon base built by the Bald Eagle method will be damaged in only five or six years. After all, the forging capacity of 3D printers is limited, which is destined to be not very reliable. We are different from them. If we want to do it, we must do the best. We must find a way to make the base stand on it for more than ten or twenty years."

"What?" Roland asked.

"We have always been struggling with the lack of perfect materials. We had planned to bite the bullet and hold the idea that it would be good for ten years to use the moon base. But we didn't expect that a special stone slab flowed into our laboratory the year before yesterday." The old man looked at Roland and smiled happily: "It is very light. Its normal soil density, and its hardness and toughness, radiation resistance, cold resistance and heat resistance under the same volume are far beyond the same volume of special metals. It is the most perfect building material we know."

Roland knew what was going on.

"How many slabs are needed?" Roland smiled and said, "I can still provide dozens of tons."

"Hahaha, kid, you're so straightforward." The old man stood up and said excitedly: "You go back to the base with me and help us make mortise and tenon parts. The more you make, the better. We have already produced the mold for you."

"The lunar base with mortise and tenon structure?" Roland was shocked: "This is indeed simple, and there is no need for nails, and there is no problem with structural stability, but how to deal with sealing?"

"The bald eagle can transport small 3D printers, can't we do it?" the old man laughed and said, "Our 3D printers do nothing else, they are specially used to spray specially made sealing materials and structures. Isn't that enough?"

Roland gave a thumbs up and admired him very much.

With a 3D printer for sealing, the reliability will indeed be greatly improved.
Chapter completed!