Luo Man's reminder was like a knife hanging above Shen Nong's head, and this knife was the insect tide, if Shen Nong did not have a way to resist the insect tide at that time, then he and all the clansmen in the Huangqiu tribe would become food in the mouth of the insect and completely disappear from this world.

"Well, now that you're back, it's time for me to go. Luo Man got up from the ground and said.

"Luo Man, if you don't live in my tribe, I can have someone build you a wooden house, to ensure that the living conditions are much better than the tree hole where you live now, and you don't have to waste any more energy for food and water, I will prepare it for you." Seeing that Luo Man was suddenly planning to leave, Shen Nong immediately persuaded him.

For Shen Nong, Luo Man is undoubtedly an existence that is also a teacher and a friend, because the other party was born in a big tribe, he knows a lot of things, and he is willing to teach Shen Nong for free, and does not ask Shen Nong to give him anything in return, which makes Shen Nong feel particularly moved.

And if Luo Man can stay in the Huangqiu tribe, it will be of great help to Shen Nong, so all kinds of reasons are mixed together, and Shen Nong especially hopes that Luo Man can stay in the Huangqiu tribe.

"Haha. Luo Man smiled and shook his head: "No, I'm used to living with my white wolves, after all, they are the few things I brought out from the Youtian Tribe." ”

I saw Luo Man whistle, and suddenly the nearby forest sounded one after another wolf howls, and after a while, a white wolf ran out of the forest and stood neatly on the edge of the grass.

"Shen Nong, if you encounter any difficulties in the future, you can come to me, as long as I can do it, I will help you. Luo Man walked to the wolf's side, climbed onto its back skillfully, and sat down steadily.

"Also...... Hopefully we'll all survive the infestation. Luo Man looked at Shen Nong with serious eyes: "When the time comes, I will teach you another kind of witchcraft." ”

As soon as the words fell, the head wolf carried Luo Man away, and the remaining white wolves also followed, and soon the figures of the wolves disappeared into the forest, leaving only the wolf howl echoing in the ears of everyone in Huangqiu.

"Hopefully. Shen Nong said secretly.

Now that there was suddenly a bug tide crisis that I didn't know when it would come, Shen Nong suddenly lost the idea of taking a bath and sleeping, and turned around and walked directly to the ravine dug by the clansmen to see how the current progress was going.

For Shen Nong's arrival, the clansmen who were working greeted him one after another to show their respect for Wu.

"Witch. Cang immediately greeted him.

"Is the soft ladder I made for you any good?" Shen Nong asked.

"It's good, but after we dug the ravine deeper and deeper, the length of the soft ladder began to be a little shorter, and Uncle Peibang and I learned your method of making it and added a section to the short ladder, so that we could last until we dug a ten-step deep gully. Cang said.

"Hmm. Shen Nong nodded with satisfaction, Cang and the others were able to learn and be flexible, which was undoubtedly a very good performance, which proved that they were growing up slowly until they could finally take charge of themselves.

I believe that in the future, even if Shen Nong doesn't come up with any good designs, Cang and the others will be able to think of some ideas that can help the Huangqiu tribe on their own.

At this moment, the figure of the Huangqiu tribesmen pulling the wooden barrel full of soil attracted Shen Nong's attention.

Digging a gully is originally a hard work, but what is more difficult and tiring than digging is how to drain the soil in the gully, like the wooden barrel soil used by the Huangqiu people is undoubtedly a tiring and laborious method, and the efficiency is slow.

You say that a wooden barrel can only hold a little bit of soil, and there is so much soil dug out of the ravine, and it is all arranged by wooden barrels, when will it be finished? And at present, the people of the Huangqiu tribe are only digging the ravines on the north side of the grassland, and there are also ravines on the east and south sides waiting for them to dig them.

With the current progress of everyone's excavation, let alone the wall, I'm afraid that the insect tide is coming, and the ravines on three sides have not been dug yet.

"It's too slow. Shen Nong said suddenly.

Cang thought that Shen Nong was complaining about the progress of the clansmen's construction, so he took the initiative to explain: "Wu, because you require the ravine to be ten steps deep, it is really difficult for us to drain the soil dug underneath, otherwise the ravine on this side has already been dug up. ”

"Hmm......" Shen Nong nodded thoughtfully, indeed, this slow soil removal has affected the overall progress of the entire wall construction plan, and if this wall can be built as soon as possible, then when facing the insect tide in the future, the survival hope of the Huangqiu tribe will be a little greater.

"You keep digging first, and I'll figure out how to drain the soil. Shen Nong thought and said.

Seeing that Shen Nong might be about to provide something eye-catching and unique, Cang immediately nodded excitedly, and then went to work on his work.

Whenever Shen Nong provides a novel design, it can bring new convenience and experience to the people of the Huangqiu tribe, which is the idea that every Huangqiu tribe has already affirmed in their hearts, and Shen Nong's design every time has indeed not disappointed them, all of them are works with great effect.

For Shen Nong, a student of the School of Architectural Engineering, he had been exposed to this kind of thing when he went to the construction site during his university internship, but at that time, the workers on the construction site were driving excavators to remove soil, which was easy and effective.

But at the moment, the people of the Huangqiu tribe will definitely not enjoy this kind of treatment, even if Shen Nong is forced to death, Shen Nong will not be able to build an excavator for them to use.

So Shen Nong thought about it for a while, and planned to use another simple and easy-to-do method to help the tribesmen drain the soil, and this method was the pulley set.

In cultural education in primary school, primary school students' homework is divided into: Chinese, Mathematics, English and Science.

As the prototype of physics at that time, Shen Nong was extremely impressed by the pulley set taught in science, which was a simple machine composed of several moving and fixed pulleys that allowed an ordinary person to lift a weight several times greater than his own strength.

If Shen Nong can make a pulley set, it is believed that the soil removal efficiency of the Huangqiu people will be greatly improved, and the excavation speed of the gullies on three sides will be accelerated.

The basis of the pulley block is that there needs to be a fixed pulley first, which is to be fixed, and then it can be used with other movable pulleys.

What Shen Nong is currently thinking about is how to make qualified and stable moving and fixed pulleys with a few materials in this primitive world.