There is a saying in the agricultural proverb that the fields are planted in the beginning of summer, and the rice fields in the May field are spread on the flat ground like silver mirrors. The seedlings in the rice fields have not been planted yet. The rice seedlings waiting to be planted together in the east and west, like large pieces of jade embedded on a silver plate.

The straight railway line seems to pass through the silver mirrors, connecting the distant horizon. The Dongfeng 4b internal combustion engine, nicknamed Big Orange by later generations, occasionally emits a trace of blue smoke, leading a dark green train to cyclize on the vast Northeast Plain.

Li Yuanling sat quietly on the 28 international train from Pyongyang-Beiping, looking at the charming early summer scenery outside the window and wearing traditional Korean clothes in the carriage. The exotic Korean conductor was full of thoughts and his heart was undulating.

When traveling alone, I always feel lonely. I haven't been home for many years. I am busy attending classes, preparing lessons and taking care of daily survival skills. I always have a lot of time. I don't have the thoughts of those long-closed memories.

Li Yuanling's hometown is located on the shore of the famous Xizi Lake. She was born into a scholarly family. Her father was a master of Chinese studies. She wrote good calligraphy and studied Chinese classical culture deeply. When Li Yuanling was in her first year of high school, her father accidentally felt a cold during a worker in the countryside. She passed away due to untreated treatment and her mother also passed away early after missing her father two years later.

During his mother's illness, Li Yuanling and his sister-in-law who looked at her mother's face had a fierce battle. Seeing her brother's appearance as if his wife was being strictly controlled, Li Yuanling, who had no worries after her mother passed away, directly applied for Shengjing Aviation College in the Northeast region. Since then, she has gone away and never returned to her hometown in Hangzhou.

It's been 20 years since Xiaoyuan is 11 years old. I remembered that his son knocked on the plate with a bitter face before leaving and said to Comrade Lao Liang: "I'm used to eating the dishes that my mother cooks, and then eating what my father cooks is like eating feed." In the future, I have to find an opportunity to take Xiaoyuan back to Hangzhou to see, so that he knows that his mother's hometown is a very beautiful place. Thinking of Liang Yuan's cute appearance and all kinds of interesting things about the family, the complex and unspeakable sour feeling brought by the memories gradually faded.

In 1987, the number of people at the Beijing Railway Station was much less than that in later generations. As soon as Li Yuanling walked out of the west exit of the Beiping Station, he saw an old couple with white hair holding a piece of cardboard with the words Li Yuanling written on it, and anxiously looked at the flow near the exit. Although Li Yuanling still recognized his former tutor and wife at a glance. Li Yuanling, who was already in her thirties, screamed and shouted loudly: "Teacher, I'm here." He ran towards the teacher's position.

Wu Zhonghua looked at the student who was crying with his wife Liao Min. Liao Min, who was also teaching engineering thermodynamics at Shengjing Aviation College back then, and liked Li Yuanling, who had just entered the school very much. After knowing that Li Yuanling was a major taught by her wife, she often invited Li Yuanling to have dinner at home. As the relationship between the two parties became closer and closer, she learned that the young Li Yuanling's parents died and became more and more maternal. Later, the couple treated Li Yuanling as their biological daughter.

Wu Zhonghua wiped his eyes, walked over and patted Li Yuanling and asked his wife, "Old Liao, Xiaoling is tired just getting off the train. Are we going home to chat?"

Li Yuanling let go of his teacher's wife embarrassedly, turned her head and bowed to Wu Zhonghua and said, "Hello, teacher, I forgot you when I saw his teacher's wife just now."

Wu Zhonghua smiled and said, "It's not hindering, it's fine if you can see you."

Liao Min glared at Wu Zhonghua and said, "Xiaoling doesn't have to worry about him for now. Tell me about when I got married and what kind of work did he do on the railway?"

Wu Zhonghua smiled and waved his hand to bring in a yellow "face" three people from T-shirt "face" got in the car and left.

Along the way, Li Yuanling briefly told her experiences over the years to her master's wife, and reported to her family members one by one. Liao Min became interested in Liang Yuan and said, "Next time, you must bring Xiaoyuan together. Your brother Jian went to the UK to settle down and married a foreign woman. You can't see anyone all year round. Lao Wu and I have retired for a lot of time. We can help you take care of your children, and you can still do the tutoring and tutoring."

Li Yuanling almost got upset, thinking that there were no two academicians of the Chinese Academy of Sciences who gave primary school students a lesson. The teacher’s wife and teacher are old and like to keep their children and grandchildren around their knees. Next time they come, they can bring their son to make the two elderly people happy.

When the three of them returned home, Wu Zhonghua ordered a table in the hotel early. Li Yuanling liked the dishes that Li Yuanling liked back then. She ate the whole afternoon and she burst into tears. Only then did Li Yuanling learn that Wu Zhonghua was rehabilitated in 1979. After restoring his work, in order to open the country and establish good relations with the Western academic community, in the past two years, 80 and 81 have basically used their prestige in the international community and led the scientific team to communicate with Western countries. It was not until the end of 1982 that he returned to Tsinghua University to serve as the department head of the engineering thermal physics major. In 1983, Shengjing Aeronautics College learned where Professor Wu Zhonghua was.

After Wu Zhonghua resumed contact with Shengjing Aviation Academy in 1983, he also looked for Li Yuanling. Due to the continuous large-scale rehabilitation of intellectuals in the early 1980s, the personnel changes were very chaotic. Wu Zhonghua did not get news that Li Yuanling was looking for herself. Until after retirement, the old couple who had free time could no longer hold back their longing and began a difficult journey of finding people in Shengjing.

By chance, Wu Zhonghua, who served as the chairman of the China Youth Science and Technology Counselor Association, looked through the entries in this year's Qingke Competition L Provincial Division and found that Liang Yuan's air conditioning fan became interested in the invention of the little guy. He picked up the entries and took a closer look and found that the shape and data of the inhalation fan looked familiar. After looking through Liang Yuan's information, he found that his mother was Li Yuanling. How could Wu Zhonghua hold on to him? He called Benxi Railway Middle School directly, which led to the scene that Liang Yuan saw at home.

Liang Yuan would never have thought that this life would become the inducement for Li Yuanling and Wu Zhonghua to meet in advance.

After chatting with the three of them for a while, they will inevitably be involved in professional knowledge.

Wu Zhonghua asked curiously: "Xiaoling, I look familiar with the air conditioner fan of that air conditioner fan. Did you help Xiaoyuan use the ternary equation to calculate the design?"

Li Yuanling looked at her tutor and smiled and said proudly: "Teacher, I helped the little guy optimize the fan shape and data. The entire principle and design idea of ​​the air conditioner fan were completed by him alone, and I didn't help at all."

Wu Zhonghua laughed and said, "It's not simple for the little guy. This really looks like Xiaoling. She has a wild mind and is unconventional. It's extremely talented to come up with this thing at this age. I guess Xiaoyuan's invention will not be a problem. When Xiaoling comes to Beijing for the finals during the summer vacation, she must bring the little guy to me."

Liao Min next to him echoed: "Xiaoling, how about you transfer your job to Peking? The living conditions and educational level here are much better than Benxi, which is also very beneficial to the little guy's future. Your teacher set up a new research institute a few years ago and set up a gas turbine project. You won't have no place to work when you come here, and your work relationship will be transferred directly to the Tsinghua Thermal Physics Department. It just so happened that the department will divide a batch of houses next year. If Xiaoling transfers her job this year, she won't even have to worry about her living place."

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