Yan Aoliu listened carefully to what Du Xi'er said, yes, why didn't he think that dogs are still watery, so they can search and rescue, and there is no harm in well-trained dogs shuttling through the disaster area, and they can even reduce casualties.

"The mountain map of the Northern Indian Dynasty that you and the princess wanted, my lord." Mo Qing taught the map to Yan Aoliu with a puzzled expression, and then didn't dare to stay longer, so as not to disturb their good deeds, and then slipped away faster than the horse.

Du Xi'er immediately reacted to Mo Qing's performance, and wanted to explain, but found that she couldn't explain, and then gritted her teeth in anger and closed the door, and then felt that her ability was wrong, and immediately opened the door.

Yan Aoliu was amused by Du Xi'er's appearance, it turned out that his princess was so cute, and then turned around and closed the door that Du Xi'er opened again.

"Well, why don't we look at the map first?"

Seeing Yan Aoliu walking towards her, Du Xi'er instantly looked at the closed door in embarrassment, and then immediately turned her head as if nothing had happened, picked up the drawing and began to look at it.

It's good that I didn't look at it, but I almost didn't send Du Xi'er away when I saw it, what kind of drawing is this, it's completely different from modern maps, and it hurts her head to see it.

The embarrassed Du Xi'er is very cute, constantly scratching her head, and at this moment Du Xi'er is like a little monkey.

"I'll teach you for my husband." He said that he pulled the little monkey boy into his arms, and then he began to point to the map and said, this is the mountain, this is the basin, this is the river, this is the village, and then here is the garrison army. ”

After Yan Aoliu's explanation, Du Xi'er finally understood the map, and then Du Xi'er fell into deep thought.

"You see, this is a river, very close to the village, if you strengthen the embankment, and then use the method of diversion, from here, here and here to dig a few rivers, in strengthening the imitation can not only prevent flooding and water transport, but also in the next summer, you can also water the farmland, but also defend against foreign enemies." Du Xi'er said a lot in one breath, but finally sighed again, and then said with a sad face.

"Although this method seems simple, the actual waste of manpower is also a lot of labor." Du Xi'er even thought of the Beijing-Hangzhou Grand Canal of the Sui Dynasty that she had learned in history class. (The Beijing-Hangzhou Grand Canal was built by Emperor Yang Guang of the Sui Dynasty, built in 468 BC, 1,794 kilometers long, and took 3.1 million people, and the final death toll was as high as 2.5 million people.) ）

Thinking of this, Du Xi'er instantly felt very sad, not to mention the loss of money and energy, but there were also a lot of deaths, although it was said that it made a huge contribution to the development of the future market, but the people at that time must have been very sad.

Seeing that Du Xi'er was silent, Yan Aoliu also knew that this was a big project, which could not be completed overnight, nor could he decide it alone, but if it could really benefit one party in the future, then why not try?

Compared with the people who die every year because of wars and famines, it may not be a benefit, and Yan Aoliu didn't think much about it for a moment, and immediately comforted Du Xi'er: "If this river is built, it will definitely benefit the people in the future, not to mention anything else, do you know how many people die in drought and flood disasters every year, they are displaced, and there are countless people who die on the way to escape, and the most of them are old girls." ”

"Okay, then let's do it."

"Then you wait at home, I'll go to the palace and come back soon."

After speaking, Yan Aoliu turned around and opened the door and left, building a very long river, for Du Xi'er before, it was even just history, it was nearly a thousand years of history, it was something he never dared to imagine, how crazy it was.

After entering the palace, Yan Aoliu quickly found Yan Beishen, reported to him to discuss the matter, and told Du Xi'er's thoughts and considerations.