For the next few days, Xiao Pai spent the next few days recuperating in the empty hall, and the previous battle had indeed overdrawn him, so that even with a small strong exercise like Luo Shenfu, he was still sick and couldn't lift his spirits. Symptoms such as fatigue and drowsiness haunted him like a stubborn illness, making him groggy for days. If it weren't for the maid who brought three meals a day on time, I was afraid that he would starve to death in this splendid palace.

Spirit Bear has been coming a lot these days, but every time he stays for a short time, as if he has something on his mind. The little thing was awkward for two days, but in the end, the child's temperament still brought it with the bear spirit, and lived in Afang Palace with Xiaopai, but also helped Xiaopai relieve a lot of loneliness. Nuwa has never been here since that day, but Sanmiao often comes to report to him about the placement of the Tianshui tribe, Xiaopai annoyed that he is open-mouthed, and really gave him some looks, but the demon king didn't care, still smiling, so that Xiaopai couldn't do anything about him. ▽□Fan△Eggplant▽ '''.-f-q-x-

In the blink of an eye, spring has arrived.

The spring breeze of Hexi blew through the desolation, awakening the greenery that had been silent all winter on Lishan Mountain. The warm spring sun shines through the dome of the main hall, illuminating the golden floor tiles more and more dazzlingly. The incessant sound of birdsong made Xiaopai, who had been in this huge cage for a while, begin to itch in his heart.

So naturally, after making this request, Sanmiao took him out of the Abang Palace, and the moment he walked out of the palace gate, he couldn't help but stretch his waist.

Then there was a completely different scenario than he had expected.

Standing on the top of Lishan Mountain and looking down, he saw a city.

From this angle, the ancient city walls look like neat models that enclose every corner of the city. △ △○Tomato△▽网 --'.'.'f'q-x-s''.-c-o'm The structure of the mud tile brick wall extends far away between the reckless heaven and earth, and the pale yellow of a mud brick that is different from the surrounding natural scenery is a symbol left by a civilization in this world.

At such a distance, Xiaopai seemed to be able to vaguely hear the boiling voice.

This is the Nuwa clan.

This is the number one family in the world.

Sanmiao took him into the city from the east gate, which was the city gate facing the direction of the top of Lishan Mountain, and several warriors guarding the gate saw Sanmiao and knelt down to salute. There are also people who secretly look at Xiaopai, as if they are curious about who this guest who is personally accompanied by Lord Sanmiao, who is sacred.

Xiaopai's attention was attracted by the well-organized architectural structure in the city. He saw a strip-shaped stone trough that stood six or seven meters in the air, and the connection between these stone troughs was very tight, and countless stone troughs were spliced together to form a huge network that shrouded the entire city. Eggplant □ '-.

"It's ...... Water supply system?" Xiao Pai said with some surprise, he remembered that he once boasted to Little Frog about the amazing urban water supply system of Athenian civilization, but he didn't expect to see it in the first city since the beginning of the wilderness.

"What the gentleman said is that these are all designed by my mother. Even the construction of the entire city, many of which were completed by the mother leading the demons to cast spells. Sanmiao bowed his head.

Xiao patted at him, this guy was far more slippery than he looked, and only when Spirit Bear was present, he would shout "Father", "Father".

These stone troughs are actually the city's water supply pipes. △ △○Tomato△▽ Net --'.'f'q-x-s''.-c-o'm The water supply system of Aristotle in ancient Athens is the concrete embodiment of the high development of ancient Greek civilization. They are often linked to rainwater harvesting systems and become an important mechanism for the livelihood of the entire city's residents. However, the conditions of the Nuwa clan are also unique, there are countless mountain springs near the city built on the mountain, which are left from thousands of meters of mountain tops, all year round, and there are several rivers near the city, which provide a strong guarantee for the city's water source.

Xiaopai carefully observed, and sure enough, he found that these stone troughs have formed an inclined angle, from east to west lower and lower, they are thick and thin, divided into the main ditch and the branch ditch, the water flows through the main ditch, through the branch ditch directly into thousands of households, the design is exquisitely not lost to the modern water system.

"Ingenuity. Xiao Pai muttered.

"What did the gentleman say?" Sanmiao had obviously not heard of this idiom.

"Nothing. Xiao Pai waved his hand and said, "Then do you also have a sewage drainage system?"

Sanmiao smiled and nodded, obviously a little complacent. Following his guidance, Xiao Pai saw a manhole appearing every few houses, and there were even small grooves around the manhole to dredge the rainwater to prevent the rainwater from flooding the city if it could not be drained in time. Xiaopai even doubted that in the continuous rainstorm, the performance of this ancient city in the desolate world was even better than Beijing.

"I see. Xiao Pai said with a sudden realization.

"What is that?"

"I've never been able to figure out how there can be a settlement of more than a million people in this world, and when I saw these things, I finally understood. ”

San Miao smiled and added, "Not counting the large and small clans attached to the surrounding area, the population of the Nuwa clan is now more than three million. ”

Xiaopai nodded.

In fact, the expansion of the clan population is constrained by various factors, in addition to natural disasters**, various dangers in the flood world, the biggest constraint is the perfect water supply system and sewage system. In places with more than a million people, the daily excrement produced by people and animals can deteriorate to the point of inhabitability in just three or four days if not properly treated. The indiscriminate discharge of household garbage and domestic sewage can also cause mosquitoes and flies, which can further cause plague and cause widespread infection, and under that medical condition, this almost means a large area of the population will die.

Only a city with perfect water supply and sewage functions is the prerequisite for the human social structure to get rid of the shackles of population and form a settlement with a population of tens or even millions. Of course, experience in another world shows that this expansion is still not unlimited, and after reaching the population level of about 10 million, a high concentration of resources will trigger the same intensity of competitive pressure, making it difficult to increase the population further, but this is another topic.

"Let's go," Sanmiao said with a smile as she looked at Xiao Pai who was looking at this and touching that with a child's novelty, "I'll take you to see your territory." ”

He paused, and then said, "It's on the sunny side of the mountainside, on the bank of the Fen River, but it's a good place." You'll love it. (To be continued.) )