During the negotiation and negotiation agreement between the two parties and the aliens, Xu Ran was not delayed in entering the 'true love scene'; in the real world, from July 20th to July 22nd, Xu Ran led the primitive people in the primitive tribe of the 'flood wilderness' to build the remaining two meters high of the retaining wall, which can be regarded as broadening the scope of the safe camp for the primitive people, at least those large-sized dinosaurs could not break through the 8-meter-high thick retaining wall.

As for whether this retaining wall will be enough to resist the attacks of other tribes in the future, then it will be up to the tribesmen themselves, at least Xu Ran told them the method of building the city wall, if they want to increase or thicken it in the future, the primitive people themselves can continue to build it.

The mound of soil in the valley can also be carried out step by step; The reason why Xu Ran didn't take the method of piling up soil in the valley first and then building the city wall was because he was afraid that he could be free to enter the 'Flood Desolation' world at any time, so he decided to help the tribesmen seal the portal first; At that time, even if Xu Ran has already left the 'Flood Desolation' world, the tribesmen can organize their own earthwork on the premise of ensuring safety.

Otherwise, when Xu Ran left, if the primitive people had not been able to complete the masonry of the retaining wall, the risk would increase, because when the city wall was being built, it was possible for people to escape back to the tribes on the high ground when they encountered the attack of large dinosaurs, and the unfinished part of the city wall was also likely to be destroyed by large dinosaurs; At that time, the valley was heaped with planting soil and it was unlikely that the retaining wall would ever be built, because dinosaurs or beasts that tasted the sweetness were likely to frequent.

In the following 6 days of the 23rd, 25th, 26th, 27th, 28th, and 30th days in the real world, Xu Ran led these primitive people to transport the planting soil from outside the valley back to the valley, and backfilled the half-meter-high soil on the rocky base in the valley, adding a new plantable area to the primitive people.

The two days of July 24th and July 29th were the days when Xu Ran needed to enter the 'compulsory mission', and he could not enter the 'Flood Wilderness' world.

Between the newly built retaining wall and the original residential heights of primitive people, a passage of 150 meters long and 1.5 meters wide was specially built at the same time, which can facilitate primitive people to push carts and transport goods on the passage connecting the retaining wall and the residential heights; The subsoil that makes up the passage is the same as the mixed soil used to construct the retaining wall, and it is compacted to a height of half a meter, which is the same as that of the surrounding planting mound.

As for the way of ascending the living heights from the valley, it is still by hanging baskets, and there is no masonry of stairs for convenience; This is Xu Ran's safety considerations, mainly because the tribe has too few people, in case of being attacked by other tribes in the future, having an external staircase is not conducive to the tribe's defense; And due to the small number of personnel, the current hanging basket tools are also enough to cope with the entry and exit of personnel......

Since July 31st, Xu Ran, who has entered the world of the 'Flood Wilderness', has been helping primitive people hunt every morning, and in the afternoon he has gone to the primeval forest to explore the region, he wants to try to investigate the surrounding environment of the primitive people's residential area, and can also help the primitive people make plans for their life prospects.

The rocky mountain range backed by the primitive tribe, because there are few places covered by vegetation, it seems that there is no business, so Xu Ran did not put this area into his scope of investigation for the time being. Xu Ran's initial investigation area for himself was within 10 kilometers from the foot of the mountain where primitive people lived.

Every time Xu Ran went out alone to investigate in the afternoon, he did not rely on walking, but after entering the deep forest, as soon as he encountered a beast that could walk, he would directly use the spiritual power command to surrender, and then began to search and investigate in the forest in a directional manner. Eventually, he would rush back to the primitive dwelling place before dark.

Of course, even if he rushed back to the primitive people's residence after dark, there was no danger to Xu Ran, but he didn't want to affect the primitive people to have dinner, after all, the primitive people had to wait for him to go back before they could eat, and he had to arrange for people to wait at the retaining wall at the mouth of the valley to greet him; At the same time, he didn't want 'Qingfeng' and 'Mingyue' to worry about his 'dark and not returned'.

As for the animals that he drove and used to travel during this period, Xu Ran originally planned to leave them for primitive people as food, which could be regarded as making more food reserves; But then I felt that after a period of mutual cooperation in the afternoon, Xu Ran felt that he couldn't bear to start, after all, in this common experience between the two sides, the animals were still very conscientious; Even if the animal he drove was a thunder dragon and was already at the top of the animal food chain in the forest, Xu Ran could still give birth to compassion.

Xu Ran believes that the choice of the legal system in nature is 'survival of the fittest', and the thunder dragon is also forced by life to eat other animals, but if he lets others finish working, not only will he not be paid, but he will also treat others as food, Xu Ran always feels a little too unkind, so let it go; fortunately, the primitive tribe is not short of food, and he can provide food supplements for the primitive tribe when hunting.

Speaking of which, Xu Ran doesn't seem to be completely reasonable, you can accumulate some more food for the tribe in the afternoon, wouldn't the tribe have more food security? But Xu Ran just couldn't wipe off his little knot, and he also thought about it, even if he saved up more food for the tribe, sooner or later the tribesmen would have to face the problem of obtaining food independently; Therefore, since not acting like this will not solve the problems that the tribe itself needs to face, let the tribesmen face it naturally.

When Xu Ran returned from each investigation, he would take the time to find some burned bricks, and sketch a simple map of his exploration area with sharp rock chips on it, Xu Ran planned to wait for the completion of the investigation, summarize these 'simple maps', and draw a 'general map of the area' for primitive people on the cliff, and mark the situation in the field, the main animals and plants in this area, so that primitive people can have a reference and starting point when they need to expand their activities in the future.

Xu Ran's spatial memory is very good now, although the feasible route in the forest is winding and twisting, and when he explores a certain local area, he does not just walk through one passage, but walks through all the passages; But this kind of local area exploration of the day, what he needs to remember, for him, is like being mirrored in his brain, and it is effortless to remember, and in this succession, the animals and plants encountered on the road are also remembered in his mind accordingly.

To be honest, Xu Ran's profound memory ability does not mean that he does not have the ability to be passed on as a 'memory skill', but that some of Xu Ran's functions in charge of memory have been strengthened, and he can retain more clear and complete information at the same time.

For example, when we play 'fight landlord' or 'five, ten, K' or 'double rise', good players from the first card began to remember the card, memory is super good, when entering the endgame, the opponent finally has some cards left, that heart is clear analysis; and after playing the cards you let him repeat the situation in front of the card, people can completely recount it; even if during this period who eats the 'fly' when the card is played (eat' 'Fly' refers to having a card in hand that must be played but not played), people are also clear, and can also decide whether to say or not to say according to their own pros and cons. (For example, in the 'five, ten, and king' games, there is a problem of 'two to one' or 'one to two', and the difference in profit is 50% if you don't say it.) And whether to say or not to say is not to violate the rules, to say 'it should be', and not to say it is 'not found, let me say it'. ）

If you have a bad memory and play cards with such a person, occasionally a few times is not good to say, a long time must be more than lose and win less, after all, the probability of both sides holding a good hand is equal, but a good player is equivalent to being able to see the opponent's hand, there is no problem of wrong cards, which is the reason for the great increase in the probability of winning.

What I said above is that everyone is playing cards above board, and there is no such thing as anyone cheating.

And this kind of good player, when restarting a new game, the memory of the previous hand is emptied, and the memory interval has started a new round of card memory, which is a skill job, and it is related to personal memory, but also related to long-term self-training in the card field; And the amount of information required for this memory, that is, the amount of accurate information that controls a hand; If you ask a good player to repeat the first hand after the second row, he usually won't be able to tell the story. Because the focus of his memory has shifted to this new hand when he starts the second hand, his previous precise memory has begun to be ignored and gradually erased.

Xu Ran's advanced memory ability that he has practiced now is similar to this, except that Xu Ran's accurate memory information is much larger than that of such a good player, so even in a complex deep forest environment, he can accurately remember a lot of scene information, but this accurate memory will have a limit after all, so every time he returns to the camp, he will record this information, so as not to be forgotten after a long time, and it can also leave a new accurate memory space for the next investigation.

On the afternoon of Xu Ran's third day, he encountered primitive people from other tribes.

At that time, Xu Ran happened to be riding a carnivorous dinosaur, and he was walking fast and slow in the forest clearing, and the place here was already close to ten kilometers away from the 'primitive tribe', that is to say, it was almost to the return point preset by Xu Ran, and the time Xu Ran was almost 5 o'clock in the afternoon, and it was about 7 o'clock in the evening when it was dark this season.

Xu Ran's hearing was very good, and he heard the shouting of a deliberately suppressed human being about 200 meters in front of him, as well as the sound of a fight; Xu Ran immediately commanded the mount under his crotch - the dinosaur quietly approached forward; During this period, the sound of fighting was always there, and the closer the distance, the louder the movement could be heard, and it was obvious that the movement could not be made by one or two people; However, the shouting of human beings only appears occasionally, and it seems that they are deliberately trying to reduce the movement.

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