Li Tangshan came down from the mountain to see how Mei Juan's bamboo was handled. Li Tangshan said to Mei Juan: "Beauty, we want to make a bamboo raft, this bamboo is very particular about the material, the bamboo must use older bamboo (the surface of the bamboo pole is light yellow), straight, thick, no crack." Like this one, it's not old enough, and the size is on the small side. This one looks pretty good, about the same size. ”

Mei Juan looked at Li Tangshan and pointed to the bamboo: "Li Tangshan, how do you know so much?" Who did you learn from? ”

Li Tangshan said: "I have lived with my grandfather and Uncle Zhuo since I was a child, they are both very good special soldiers, and they taught me these skills for survival in the wild. ”

Li Tangshan suddenly stopped as he spoke, and he missed Uncle Zhuo and his family very much. Li Tangshan looked up and saw Mei Juan chopping bamboo, and he also missed Tian Lilai very much in his heart, and shouted to Mei Juan: "Tian Li! ”

Mei Juan heard Li Tangshan shouting, raised her head and asked, "What's the matter, what did you want to tell me just now?" ”

Li Tangshan said: "I think of my family and girlfriend, Mei Juan, you really look like Tian Li!" ”

Mei Juan looked at Li Tangshan, who was a little sad, and said, "After we go out, you will go home to see your family." ”

Li Tangshan sighed: "Without the shuttle, I can't go back." I would love to go back too. Mei Juan: How are your bamboo preparations? You try to choose winter bamboo, cut down the selected bamboo and remove the branches and leaves first, leaving a thicker part, pay attention to the bamboo tube must not be damaged! ”

Mei Juan nodded: "Okay!" ”

Li Tangshan said: "I cut the chopped bamboo into a suitable length with a chopper. Three to four sturdy, thinner bamboos are also needed for the support structure of the raft! The diameter is about 5 cm, and the hardness is strong enough! ”

Li Tangshan gave Mei Juan a 5-centimeter length. Mei Juan nodded.

Li Tangshan prepared the materials and put them into the stream, and the bamboo drifted downstream with the flowing water.

Li Tangshan turned to Mei Juan and said, "Beauty, it's almost over, let's go to the underground river to have a look." ”

Li Tangshan and Mei Juan came to the small lake and saw that there were a lot of bamboos in the lake.

Li Tangshan took the bamboo from the lake and put the bamboo on the shore, and stacked the bamboo in the flat place!

Li Tangshan selected the prepared bamboo materials and arranged them neatly on the flat floor. After arranging, put away a part of the bamboo material, leave about 6 bamboo materials, and put about 3 bamboo raft skeletons, one every 1 meter, and fix them with Teng strips at right angles to the bamboo materials.

Li Tangshan took an hour to tie up the bamboo raft and put the prepared bamboo raft into the shallow water area for buoyancy test, otherwise his life would be in danger. If the buoyancy is not enough, you need to increase the buoyancy auxiliary block. Li Tangshan jumped on the bamboo raft to test it, the buoyancy was enough, the bamboo raft was solidly tied, and Li Tangshan was generally very satisfied.

Li Tangshan took Mei Juan's hand and got on the bamboo raft together, paddling towards the cave above the underground river.

The inside of the cave is pitch black, and you can't see your fingers, which makes people feel a sense of fear. I'm afraid I'll accidentally hit the wall. Whenever a figure floated in front of them, Li Tangshan and Mei Juan couldn't help but feel creepy, hoping to get out of the cave as soon as possible. Li Tangshan took Mei Juan's hand, and Mei Juan's heart was a lot more uneasy and calm. Li Tangshan lit a torch, and the torch instantly illuminated the cave, which was not very large. There are a large number of beautiful and colorful, delicate and transparent stalagmites, stone milk, stone pillars, stone curtains, stone flowers, dazzling.

Li Tangshan and Mei Juan didn't go far, and there was no way to continue to move forward. Mei Juan discussed with Li Tangshan, or come back and be fully prepared.

Li Tangshan and Mei Juan went back to find Huang Shigong and saw that Huang Shigong had already prepared breakfast. After the three of them had breakfast, Li Tangshan discussed his idea with Huang Shishan, which was to make an underground pipeline in the river above ground and transport air all the way in, so that Li Tangshan and Mei Juan could have about 15 minutes to continue to move forward by pipeline air. The remaining section of the lug was the most practical solution he could think of at the moment.

Li Tangshan said: "Senior, you have good water quality, I want to ask you to help me figure out the structure in the river and see where there is a resting point?" I designed an air supply system based on a topographic map. ”

Huang Shigong nodded and said, "Xiaoyou, is there no problem with this?" We're going to do it. ”

Huang Shigong really lived up to expectations, helped Li Tangshan have a general understanding of the structure of the dark river on the ground, and arranged a guide rope in the dark river.

Li Tangshan used large bamboo to make sections of pipes, and you used fish glue to seal the interface, and every gas supply pipeline in the Great Qin Dynasty was born under the auspices of Li Tangshan. With the help of Huangshi Gong, Li Tangshan gas supply management has been laid in the underground river.

Although there are pipelines, how they supply gas to the management is a lot of problems. Li Tangshan inadvertently looked up and saw the waterwheel by the lake, thinking that there is a way to solve the power problem, how to solve the blower?

Li Tangshan drew the appearance of a windmill on the ground and asked Huang Shigong: "Senior, is there a way to build a windmill according to this pattern?" ”

Huang Shigong didn't understand it after looking at it for a long time, and shook his head.

Li Tangshan saw Huang Shigong shaking his head, and his heart was half cold. If even the scientists of Huangshi University did not know how to build it, the air supply management would not be used.

Mei Juan tied up the bamboo raft and ran over to see Li Tangshan and Huang Shigong squatting on the ground to watch Li Tangshan's drawing, so she deliberately damaged Li Tangshan, and learned from Li Tangshan to speak: "Li Tangshan, how ugly is the gossip wind wheel you draw?" Is it scary to have no culture? ”

Huang Shigong reacted to what Li Tangshan's picture was, and said: "Young man, you can draw a gossip wind wheel, this is more than 600 years old since Jiang Ziya's invention by Taigong, how can you not do it." ”

When Li Tangshan heard that the Huangshi Guild was making a windmill, he jumped up happily, hugged Mei Juan and kissed him wildly, Mei Juan was ashamed: "Li Tangshan, you are crazy, put me down quickly, what are you kissing me for?" Seniors are still here? ”

Huang Shigong laughed, turned around and strode home.

Mei Juan pushed Li Tangshan away and quickly followed behind Huang Shigong. Li Tangshan had no choice but to run Mei Juan and them quickly.

A few days later, Huang Shigong quickly made a windmill, and under Li Tangshan's continuous guidance, a large windmill was ready. Everyone carried the windmill to the lake, Li Tangshan found some leather to make a belt and placed it on the windmill at one end, and placed the waterwheel at the other end to drive the wind to rotate, the air was constantly pressurized, and the water in the pipe was slowly discharged, and the gas supply system began to work.

I've been preparing and I'm going to continue, and I can leave tomorrow. Everyone should have a good meal.

Li Tangshan came back from hunting a pheasant in the woods, made a best chicken and grilled fish, and made Mei Juan scold Li Tangshan, she had no conscience, and she didn't make such a delicious thing for her to eat earlier, which made Huang Shigong laugh.

Li Tangshan said: "Everyone is so happy, I will sing a song of our hometown to everyone. Mei Juan patted her head and shouted: "Okay! ”

Li Tangshan cleared his throat and sang loudly: "Outside the long pavilion, by the ancient road, the grass is green. The evening breeze blows the willow flute, and the sunset is outside the mountain. The end of the sky, the corner of the earth, the acquaintance is half scattered. A pot of turbid wine is full of joy, don't dream cold tonight. Outside the long pavilion, by the ancient road, the grass is green. Ask you when you will go, and don't linger when you come. The end of the sky, the corner of the earth, the acquaintance is half scattered. Life is rare for reunions, but there are many separations. ”

Li Tangshan's singing deeply touched the softest part of Mei Juan's heart, and tears couldn't stop flowing out. Li Tangshan was finally able to understand the feeling of Uncle Li's farewell back then, living with Huangshi Gong in the past few months, and he began to be reluctant to Huang Shigong's predecessors, and the corners of his eyes also flashed.