"This American professor would say such a thing to his own students." Seeing this, Xi Xue sighed, raised her head, and just met Yang Shuoming's gaze, "Perhaps, it's because the students are too good." ”

The professor said this because he didn't have the same good conditions as me when he was a child. Because my father understands modern education very well, on the one hand, he let me study science and engineering and take the road of a technological power; On the other hand, they sent me to study music and painting. Since I was a child, I have been interested not only in science, but also in art. These artistic accomplishments not only deepened my deep understanding of the poetry and life philosophy in the works of art, but also learned the macro image thinking of a large span in art. Yang Shuoming recalled his father who had passed away for many years in another time and space, and a trace of gloom flashed in his eyes.

"My father always believed that these things were important in inspiring a person to innovate in science. Scientific innovation does not rely only on rigorous logical thinking, innovative ideas often start with image thinking, get enlightenment from large-span associations, and then use rigorous logic to verify them. ”

Xi Xue noticed the subtle change in the expression on Yang Shuoming's face, she didn't say anything more, but looked at him quietly with a focused and concerned gaze.

"I am writing this because when we run a school today, we must have the spirit of scientific and technological innovation of MIT, and cultivate talents who can use their brains and have extraordinary creative ability. After returning to China for so many years, I feel that there is no such school in China, and it is all average, and only what others have said is said, and what has not been said dare not be said, so it is impossible to cultivate top handsome talents. Our country should solve this problem. Whether you are truly innovative depends on whether you dare to study the frontier issues of science that others have not studied, rather than what others have already said, we know, and what we have not said, we don't know. The so-called excellent student is to be innovative. Without innovation, rote memorization, no matter how good the test score is, it is not an excellent student. Just a bookworm who reads dead books. ”

Yang Shuoming's expression returned to normal in an instant, he looked at Xi Xue's bright and incomprehensible face, and continued, "

That's the kind of education I received at MIT, and that's what I felt the most. After returning to China, I feel that the country attaches great importance to education, but the construction of the country needs more and all kinds of talents, and only when there are more talents can the country have great development. It's not enough to rely on people who have returned from overseas. ”

"I've written so much about this to tell you that we need to learn from MIT and learn from its scientific innovation. All of our Chinese students who went to study at MIT have played a very good role after returning to China. All those who have studied there have been influenced by its innovative spirit and know that it will not work without innovation. We can't follow the crowd, this is not the spirit of science, the most important thing in the spirit of science is innovation.

"Life is short, and when I think about China's long-term development, I am worried about this." Yang Shuoming remembered the Chinese education system in that historical time and space in which he lived, and couldn't help but sigh deeply again.

"How old are you! but he spoke in a tone like an old man. That's not good. ”

Xi Xue looked at him as if he was preoccupied, and she didn't understand why he had so many worries, she wanted to make him happy, but she felt as if there was nothing to think about.

Yang Shuoming smiled, his gaze fell on Xi Xue's hand all of a sudden, he leaned forward, and reached out to hold her slender fingers.

Xi Xue startled his sudden movements, and although it was not the first time he had shaken his hand, she still felt that her face was a little feverish.

Yang Shuoming gently stroked her delicate and delicate twing, and asked softly, "Didn't Xi Xue want to go over and learn something that she was interested in?" ”

"I'm already learning, huh?" Xi Xue smiled lightly, "I've learned a lot from you. ”

"Your fingers are thin and long, which is good for playing the piano." Yang Shuoming said thoughtfully, "Or do something related to delicate handicrafts." ”

Hearing Yang Shuoming's words, Xi Xue's heart chuckled involuntarily, and her body seemed to stiffen a lot.

At this time, she unconsciously had a vision in her mind that she had experienced before.

“…… This sister of my family is smart, bold and big, and I have studied art for many years, and I have done my best to teach this work, and I am a child who grew up in the mountains, and I can definitely help you a little bit. ”

"This is unacceptable, grandpa, you are old, who will take care of you for dinner and tea......"

"Silly baby! Grandpa is now a handful of years old, half of the people who have been cut into the ground, how many days do they have to live? When you are like a flower, how can you stay at home and spend the moon in vain, are you willing to marry those murderous bandits in the future? Grandpa, although I am old, my vision is still there, look at their spiritual temperament is the most benevolent and righteous, they are all characters who want to do great things, you just have to go to the world with them, make a lot of money, if grandpa is not breathing yet, you will come to pick up grandpa and go out with you to enjoy happiness......"

"I love the piano, but I haven't learned it." Xi Xue worked hard to dispel the memories of the past from her mind, and she followed Yang Shuoming's words and said, "I don't know if it's too late to learn now." ”

Xi Xue found that her voice seemed to be a little hoarse, but Yang Shuoming didn't seem to notice it, he let go of Xi Xue's hand with a smile and nodded.

"It's not too late." Yang Shuoming looked at her and said, "However, you'd better learn it early, because I want to hear you play and see you play the piano." ”

"Hmm." Xi Xue smiled innocently and naughtily like a child, and nodded vigorously.

"To live and learn, there are still a lot of things to learn in this life." Yang Shuoming glanced back at another thick manuscript on the table, and sighed, "We are all the same. ”

Xi Xue followed Yang Shuoming's gaze and saw the title of the letterhead, which read, "On the Governance of the Huanghuaihai River and the Overall Development of the North China Plain."

Seeing this line of text, Xi Xue's mind involuntarily came up with the ancient saying "The saint comes out, the Yellow River is clear", but she didn't say it.

In the time she spent with Yang Shuoming, Xi Xue already had a very deep understanding of Yang Shuoming's spleen surname, and she knew that he didn't like others to praise him with words like this.

Although she knew that, with his contributions, he deserved such a title.

A few days later, the contents of the manuscripts appeared on the desktop of He Qianli, the chief minister of water resources, as a printed document in pencil type.

"The Huang-Huai-Hai Plain spans five provinces of Hebei, Shandong, Henan, Jiangsu and Anhui and the two cities of Beijing and Tianjin, with a total area of about 350,000 square kilometers, of which about 2 are cultivated land. 700 million acres, with a large population. The geographical characteristics of this region are: first, the climate belongs to the semi-humid warm temperate zone, the average annual temperature is 10 to 15 degrees, the annual frost-free period is 175 to 225 days, the annual precipitation is 500 to 1000 mm, the spring is dry, and the evaporation is strong. In summer, the humid and warm air mass from the southeast and the high-pressure cold air mass from the north meet, or they rise and merge along the foothills of the Taihang Mountains to form heavy rainfall. Second, the Yellow River is thick with sand, and in history, it silted up the tail of the Haihe River when it traveled north, and harmed the Huai River when it traveled south. Therefore, the plain is below Mengjin, north to Tianjin, south to Huaiyin, not a concave catchment basin, but a conical delta with a convex area, covering an area of 250,000 square kilometers. The river forms a high hanging ridge under the support of two embankments, and the old traces of the river channel are left in the north and south; In the north, there are Wei Canal, North Jindi River, Wenyan Canal, Maji River, Tuxiao River; In the east, there are Wanfu River, Dongyu River and the Yellow River; There are more than 20 rivers such as Huiji River, Whirlpool River and Jialu River that flow into Huai River in the south. These show that the water and sediment of the Yellow River were originally sent out to the sea in turn on this delta. The plain is vast for thousands of miles, the terrain is flat, the transportation is convenient, it is suitable for machine farming, and the development of agriculture and animal husbandry in a large area. Third, the plain can be divided into three areas from west to east: the western foothill slope is greater than 1:3500, the soil is coarse, the infiltration and drainage are smooth, the groundwater is buried more than 4 meters deep, the salinity is small, and the agriculture is the most developed. The slope of the central alluvial plain is 13,500 to 1:6,000, most of which are the places where the Yellow River has flowed historically, with fine soil and groundwater depths of 2 to 3 meters. The landform is either slow or shallow, and the salinization varies from light to severe. The average slope drop of the eastern coastal plain is 1:6000 to 1:38000, the soil is very fine, the groundwater depth is very large, and the salinity is high, becoming a large area of saline-alkali wasteland. Both the central and eastern parts are formed by the flood of the Yellow River. It can be seen that the Huang-Huai-Hai Plain is dry in spring, so the soil is more salinized. In summer, rainfall is abundant, and when it rains more than 300 millimetres in the first month, it causes flooding. In autumn, when it rains, poorly drained areas are often waterlogged. The overwintering is three feet freezing. Of these four evils, drought and salt are the most, followed by floods. Commentators may say that there is a shortage of water in North China, but the only way to rely on the river is to sing it with the people, and it is almost a foregone conclusion. ”

However, according to history, the Yellow Emperor's war is especially in Zhuolu, Xia Shang built the capital here, and Jing Ke of the Warring States period offered Tu Du Kang, that is, the area of Xiongxian County today, which should be a good field. Compared with the cave dwelling of my ancestors 6,000 years ago, it was only after our people migrated from the Shaanxi-Jin Plateau that clothing, chariots, horses, and palaces appeared. On this plain, the four generations of Han, Manchu and Mongolian people of the Song, Yuan, Ming and Qing dynasties competed with each other, and the culture was mixed to prosper. It is a good land in the plains, which may not be able to supply the water needs of the well-developed industry and agriculture. ”

"From the topography, the plain north of the Yellow River is west of Taihang, north of Yanshan, south of the Yellow River, three sides of artesian water, east flow overseas. The annual precipitation in the region is 600 mm, and the main water is not too much. To the south of the Yellow River, the terrain is inclined from northwest to southeast, and the west of the Xiong'er Landscape flows into the Luo River in the north, and the Funiu Landscape enters the Huai River in the east or the Danjiang River in the south, all of which do not flow eastward to help the Huanghuai Plain. The precipitation in the south of the Xinghe River is more abundant than that in the north of the river, and he said that if the water of the Danjiang River is diverted for artesian irrigation, it is reasonable to say that it is based on the hydrological and geographical conditions alone. The crux of the problem lies in diverting the water and sediment of the Yellow River from the north to the south and silting up the North China Plain, and at the same time controlling the sea and Huaihuai, and pumping and discharging brine, so that floods, waterlogging, drought, and alkali can be eliminated. Combined with measures such as setting up agriculture, rectifying land and water communications, and equipping energy projects, the economic development of the Huang-Huai-Hai can be said to be just around the corner. ”

"The economic development of the Huang-Huai-Hai Plain is multifaceted, and it must be prioritized, and some must be carried out simultaneously. How to develop and make good use of the natural resources in this region is the most concerned by the Chinese people. Due to drought and alkali, the average yield per mu of large-scale grain crops in the region is still far from the average yield of wheat per mu in the world. The region's grain output accounts for about one-fifth of the country's total output, cotton accounts for about half, and soybeans, peanuts, and flue-cured tobacco account for about one-quarter. ”

"If we want to eliminate drought and flood salinity and improve agriculture in order to improve agriculture, we must increase water and sediment resources, silt and pressure alkali, and remove brine to improve the soil. It has become a foregone conclusion that the sea, Luan, and Huang divert water from three sides to help the north of the river. However, irrigation and drainage must be effective on the basis of flood control, and impromptu benefits must first eliminate harm. Under the situation of water shortage in the Huang-Huai-Hai Plain, it is precisely the Yellow River that needs to be diverted for flood control, which is not widely recognized by the Chinese people. So far, some scholars in China believe that the Yellow River should 'drain' sediment under the constraints of two embankments, and all the flowing water should be assigned to the task of transporting sediment to the sea as much as possible, rather than sending it to both banks. This kind of thinking has become the reality of the current shortage of water and fertilizer in the Huang-Huai-Hai Plain, and the waterways in North China are not navigable. The erroneous understanding that has always been common in academic circles has caused the national economy to suffer great losses, and nothing worse than this! ”

"The management of the Huang-Huai-Hai River and the construction of water conservancy in the Huang-Huai-Hai Plain are two sides of the same coin, and the whole system must be planned in an integrated manner. In order to perfectly exploit and utilize the natural resources of the whole region, the above-mentioned water conservancy measures to control floods, waterlogging, drought, and alkali are the main ones, but they are not enough, and various biological measures must be taken, that is, afforestation and grass planting in the upper reaches of the plain rivers to conserve water sources and increase dry flows. This will increase the total amount of water stored in the space, surface and underground water, which is conducive to improving the local ecological environment and microclimate. ”

"To improve the local vegetation and restore the ecological environment, we should give priority to planting sea buckthorn."

"Sea buckthorn is a deciduous shrub, its special surname is drought tolerant, wind and sand resistance, can survive on salinized land, and is distributed in North China, Northwest China, Southwest China and other places. Seabuckthorn is a medicinal and edible homologous plant, which can be widely used in soil and water conservation. Due to drought and lack of rainfall, the land in Northwest China is barren, and it is difficult for trees to survive or grow into small old man trees directly planted in most areas, and it is very difficult to restore vegetation. Seabuckthorn has the characteristics of cold resistance, drought resistance, barrenness resistance, generally only 120 to 150 trees need to be planted per mu of wasteland, and it can be closed into a forest in 4 to 5 years. And the seedlings of sea buckthorn are smaller, generally the plant height is 30 to 50 cm, the ground diameter is 5 to 8 mm, and the labor intensity of planting sea buckthorn is not large, one person can plant 5 to 6 acres of sea buckthorn a day, which is convenient for large-scale planting and rapid restoration of vegetation. ”

"Due to soil erosion on the Loess Plateau, a large amount of sediment has accumulated in the lower reaches of the Yellow River, raising the riverbed 4 to 6 meters above the ground and reaching a maximum of 14 meters, and it continues to rise every year. The embankment of the Yellow River, which is the entire North China Plain and the Huanghuai Plain, has not been strengthened on a large scale since the Republic of China, and has now exceeded the surface of the river by more than ten meters. The higher the levee, the greater the potential danger of overflowing. The flooding of the Yellow River is still a problem for the Chinese nation. The sediment problem is the root cause of the flooding of the Yellow River. ”

"The most serious soil erosion on the Loess Plateau is one of the ditches and the other is the steep slope. Due to the barren land and difficult construction, the steep slope is a weak link in the control of soil erosion. The ditch is not only the main production area of sediment, but also the channel of sediment on the slope. The bushes of sea buckthorn are dense and the root system is well developed, and the folk proverb is 'an umbrella on the ground, a blanket on the ground, and a net underground'. On some steep slopes, sea buckthorn can use its special surname of sprouting roots to green areas that are inaccessible to these people. In particular, after the sea buckthorn becomes a forest at the bottom of the ditch, it has a strong resistance to erosion, and it is not afraid of sand burial, and the root tiller is strong, which can block the flood discharge, intercept the sediment, and improve the channel erosion datum. Although there are thousands of ravines on the Loess Plateau, sea buckthorn has extremely strong vitality and rapid reproduction ability, which is an effective weapon for controlling ravines. Several counties in Northwest China have been planting sea buckthorn for two years, and the vegetation coverage has reached more than 30%, which has proved that sea buckthorn is an effective measure to control the sediment of the Yellow River. ”

"Most areas of the Loess Plateau have sparse vegetation and an extremely fragile ecological environment. With sea buckthorn as the pioneer tree species, it can not only restore vegetation quickly, but also restore the biological chain as soon as possible. Guy sea buckthorn can not only adapt to the harsh natural environment, but also because of its strong nitrogen fixation ability, can provide nutrients for the growth of other plants, create a suitable environment for survival, is an excellent pioneer tree species and mixed tree species. According to the survey, after 4 to 5 years of artificial planting, the sea buckthorn forest is overgrown with weeds, and there are some secondary poplars, elms and other tree species, which naturally form a variety of plant surnames. The results of the experiment showed that the growth of poplar, elm and black locust mixed with seabuckthorn woodland and the control planted on barren slope increased by 129.7%, 110.5% and 130%, respectively. According to the measurement of Youyu County, Shanxi Province, the soil organic content and nitrogen content of the six-year-old sea buckthorn forest were 2.13% and 0.11%, both of which were more than 1 times higher than that of cultivated land. The wasteland after the growth of Changsha thorns does not apply any fertilizer to grow crops, and the yield of the year is more than 1 times higher than that of ordinary farmland, and the soil fertility has not weakened for 3 years. ”

"Sea buckthorn has high nutritional, ecological and economic value, especially in the construction of shelterbelts. China is the country with the largest number of sea buckthorn resources in the world, mainly distributed in North China, Northeast China and Northwest China, among which Shanxi Province has the largest distribution. The total area is about 1.2 million hectares. Surface runoff is reduced by 80%, topsoil loss by 75% and wind erosion by 85% on land covered by sea buckthorn. Planting sea buckthorn will achieve three major benefits: ecological, economic and social. The seabuckthorn industry can be used as a breakthrough to accelerate the control of soil erosion on the Loess Plateau and promote local economic development. ”

(To be continued)