[Clear waters and lush mountains - end]

Yue Xingwen and Jiang Pingce sat outside until 3:00 in the morning. The expected sandstorm did not come, and the two of them couldn't take it anymore, so they went back to the base to change shifts, and let the second group of students continue to watch the night.

When he woke up the next morning, Yue Xingwen found that their project was intact.

It was windy last night and the weather today is rarely sunny. However, when the sandstorm doesn't come, everyone can't be relieved. After all, their project has not been tested, and no one knows whether it is a success this time.

Yue Xingwen looked at Lin Manluo and asked, "Senior sister, do you want to wait for a sandstorm to confirm that there is no problem with the project before proceeding to the next step, or will we continue with the next step from today?"

Lin Manluo frowned and took the exam carefully for a moment, then gritted her teeth: "Let's wait and see. If there are any loopholes, we are rushing to the next step. If the planted plants are destroyed, it will be too late to replant them, and the funds will also be not enough."

Jiang Pingce agreed: "The first phase of the acceptance is successful, and then the second phase is continued. This is more secure."

It's just that their projects are not accepted by higher-level professionals, and can only be handed over to the library for verification.

The next day, everyone will simply take a holiday, stay at the base to rest, and pay close attention to the weather outside.

Since there is plenty of light during the day, there is no need to stay outside to observe in person. Ke Shaobin only needs to put a small picture outside, and every few minutes, it is enough to take a picture and transfer it to his laptop.

Twelve people sat together, chatting while waiting for the sandstorm.

The whole day passed, and the sandstorm still hadn't come. Liu Zhaoqing sighed: "This library doesn't come when it's supposed to come, and it's really annoying to have a surprise attack when it shouldn't."

Yue Xingwen reminded: "Don't relax, keep vigil tonight."

In the evening, the students in the second group waited until 3:00 in the morning, but still did not wait for the sandstorm, Zhuo Feng whispered: "If the sandstorm doesn't come, we can't wait forever, right? I'm worried that the time for planting trees in the third stage will not be enough. use."

Lin Manluo gritted her teeth and said, "Wait for two days at most. If there is no movement the day after tomorrow, we will continue to the next step."

I don't know if the library was deliberately trying to kill their patience. The night was still peaceful. Until the afternoon of the third day, Ke Shaobin wanted to go out to take a look. Face. He immediately shouted excitedly: "Come here!"

The other students hurried out and looked into the distance together.

The strong wind really drove the quicksand towards them, and the momentum was like a galloping horse! However, after encountering the first layer of barriers, the sand was partially blocked by the wall, and a lot of it came out of the sand discharge port and continued to rush forward——

The billowing yellow sand rushed towards them, and the wind this time was much stronger than the first nighttime sandstorm!

The students were sweating on their palms, fearing that their project would be destroyed again.

What is gratifying is that after being intercepted by layers of sand barriers, the amount of quicksand was significantly reduced. By the fifth floor, there was not much left, and by the sixth floor, the quicksand was completely blocked by the wall!

The barrier they designed has a total of eight layers.

Lin Manluo almost jumped up excitedly: "Success!"

Ke Shaobin was also very excited, he looked back at the farmland not far behind him, "There are still two layers of walls that are useless, that is to say, even if there is a more powerful sandstorm than this in the future, the quicksand will not flow to the farmland? "

Lan Yarong smiled and patted Lin Manluo on the shoulder: "Manluo is doing well. In this way, our task of preventing wind and sand fixing is half completed. These eight layers of barriers are enough to ensure that the farmland around the town is not destroyed."

Lin Manluo finally let go of her dangling heart in the past few days, and a smile appeared on her face: "Great, this is the result of everyone's calculation, and now it has finally been verified!"

Yue Xingwen breathed a sigh of relief and looked at Jiang Pingce.

He was also very nervous these two days. After all, the funds in his hand were running out. The worst plan was to go back to the first floor to rebuild together after failing the course. But it turns out that their data calculations and sand table model drills are still very effective, and the projects based on the models are very perfect!

It will never be like in the beginning, when the sandstorm comes, the defense project collapses directly.

Yue Xingwen concluded with a smile: "It is a very wise decision to do the experiment first and then the formal construction."

Zhuo Feng nodded: "That's right. After the sandstorm passes, Manluo will start to arrange the next stage of tasks!"

Their current project only prevents quicksand from invading the farmland and ensures that the residential and cultivated land is not affected, but does not fundamentally solve the problem. The test requirements are to manage the environment and improve the state. Therefore, they must not only prevent, but also control the key.

Lin Manluo opened the project plan and said quickly: "The last stage is to level the sand dunes to build land." She pointed to the distance, "The large sand dunes in front are the key reason for the sandstorms when it is windy. Our team With Xiao Nian from the Department of Architecture, the work of leveling the sand is very easy to do, just use the bulldozer to level the sand dunes."

Zhang Xiaonian took out the mapping paper, looked at the data, and said, "Such a large area of ​​sand dunes will take about... half a day to complete, is that okay?"

Lin Manluo smiled: "It's been a long time. Your ability is much more efficient than a normal construction team."

Yue Xingwen asked: "The sea buckthorn you chose before can grow in the sand, but if the sand is not firm enough for the plants to take root, and the wind blows, will the trees you plant be blown down?"

Lin Manluo nodded: "Yes, although plants such as sea buckthorn and Salix can survive in harsh sandy land, they cannot live directly in the sand. This land needs to be remodeled. The best way is It is to divert water and pull sand to create land.”

Ke Shaobin was stunned: "Diversion?"

Lin Manluo: "Since there are towns and arable land nearby, there must be water sources. We need to build some diversion channels. The water sources will be brought in for watering, creating a sandy land suitable for planting plants, and then planting the saplings."

Jiang Pingce reminded: "There are still 9 days before the end of the exam, is it too late?"

Lin Manluo thought about it for a while, and said, "It should be in time. We have junior and senior fellows from the School of Architecture, and the speed of digging canals is very fast."

Yue Xingwen immediately made a decision: "Okay, go with Pingce and Ke Shao to find water sources, and the others will help Xiaonian level the sand dunes. Senior Sister Lin, you should make a plan for planting trees as soon as possible, and look at the water channels and plants. How to distribute."

The people began to divide their work.

With Jiang Pingce's parabolic motion of the coordinate system and the radar reconnaissance of the small map, the three of them quickly found the water source nearby, and the water was diverted from here. The speed of digging the pits with the excavator is very fast in the year. When the time comes, the dug pits will be covered with a layer of cement, which is a simple water channel.

At the same time, Lin Manluo also discussed with his teammates to draw an area for afforestation, and designed the distribution of the canals. The canals are arranged vertically and horizontally to form a "field" shape, which can be watered in all directions. Plants are planted in the squares in the middle. , the final remodeled afforestation project will be more aesthetic.

After doing all the preparatory work, Zhang Xiaonian started construction.

His excavator skills have now reached level 4, and the speed is several times faster than at the beginning. In just one afternoon, Zhang Xiaonian completed the projects of leveling the dunes and digging the canals.

Everyone rested at the base overnight and got up to work again the next morning.

Lin Manluo said to Yue Xingwen, "Xingwen, how much money is left?"

Yue Xingwen: "If you buy sea buckthorn seedlings, you can buy thousands of them."

Lin Manluo opened the store and looked at it, and said, "Buy some more grass seeds. I saw that grass seeds are very cheap, and buying a few kilograms is enough to plant a large piece. Even if the seeds are sprinkled, even if they only survive half, the whole area will be affected. Environmental improvements are also helpful.”

Yue Xingwen nodded. According to Senior Sister's advice, the remaining funds bought about 1,000 sea buckthorn saplings, a few kilograms of grass seeds, and tools such as shovels. 12 people began to plant trees separately.

During the annual Arbor Day, the school often organizes students to plant trees. Yue Xingwen still remembers that when he was a freshman in high school, he planted a willow tree in the open space behind the school. Later, he and Jiang Pingce went back to his alma mater. , which can be used by the younger brothers and sisters to enjoy the shade.

How long does it take for trees planted in sandy land to grow?

Jiang Pingce deliberately calculated the distance in order to prevent the students from planting trees crookedly, and used a triangle to draw the entire field-shaped transformation area into a chessboard-like coordinate system, and told everyone: "Plant trees at the junction of the chessboard, so that every two The distance between trees will be the same."

Yue Xingwen held back a smile and said, "Is this the obsessive-compulsive disorder of the mathematics department?"

Jiang Pingce: "It will be ugly if the trees are arranged in a 'chaotic' manner, so let's make them tidier." He paused, then said, "What's more, can't sea buckthorn bear fruit? It will take a few years for this batch of trees to grow. When they are mature enough to bear fruit, they are neatly arranged and convenient for local residents to pick.”

Yue Xingwen nodded in agreement: "Well, Pingce is still thoughtful. Everyone will plant trees at the intersection according to the coordinate system!"

Lin Manluo reminded: "Don't dig the hole too deep to drown the roots of the saplings, and then fix the saplings about 15 centimeters up! Just remember to water some water after planting."

Yue Xingwen: "You don't need to water, just let it rain."

The crowd stood in 12 rows, each planting a row.

Since Jiang Pingce drew a line on the ground and stipulated the coordinates of each dead tree, everyone planted saplings one by one according to the coordinate points. Even if 12 people planted trees at the same time, it would not be "chaotic".

The more trees are planted, the more everyone will find...the neat ones are really good looking!

Thousands of saplings are divided by 12 people, and each person needs to plant about 90 saplings. In order to catch up with work, everyone simply stayed overnight. It took a day and a night to plant all the saplings. water again.

Everyone was a little worried when they stood in the distance - the trees they planted by themselves, do not know how much survival rate they can have? They are a group of laymen, and they have done their best to achieve this, and then they can only resign themselves to fate.

Yue Xingwen looked at this spectacular project and said with emotion: "It's hard to believe, it was made by 12 of us."

Jiang Pingce: "With the help of supernatural abilities, we can complete it in such a short time. There are still 6 days until the end of the exam. Next, everyone should not be careless and consolidate the results."

Everyone nodded.

In the next time, everyone went to the woods every day to make a circle, and watered the areas that were short of water in time. When the wind is strong, in order to prevent the saplings from being blown down by the wind, they also reinforce them with triangular stakes.

Time flies, their 1 day is equivalent to 24 days in this world.

Those saplings actually sent out green shoots at a speed visible to the naked eye!

Seeing that one sapling after another successfully survived, everyone was very excited.

On the last day of the exam, the picture in front of you suddenly changed, and a line of words appeared in everyone's floating box: "Congratulations to the 183 research group for passing the exam. What you see is the sand scene ten years later."

In the distance, the sea buckthorn they planted grew rapidly as if enchanted. Between the green leaves, a large piece of orange-colored fruit was formed, and the dense orange-colored fruit the size of a small bean was connected into a piece. , stretches for thousands of meters, extremely spectacular!

Ke Shaobin looked at the fruits, almost drooling: "Just to see, not to eat?"

Lin Manluo was so excited that her eyes filled with tears: "This is the scene ten years later, everyone has worked hard!"

They planted every tree with their own hands. At that moment, the sense of accomplishment in everyone's heart was beyond words.

It is precisely because of their efforts that ten years later, in this land that was originally barren, desolate, and plagued by quicksand, a large number of green plants appeared, and they bore the sweetest fruits.