Central Park, Beijing.

Because of the victory in the First World War, the city of Sijiu had already had a few days off to celebrate according to the regulations, but the educational circles felt that it was not enough, so they simply let the schools in Beijing have another three days off to hold a larger-scale celebration of the victory of the Allied powers.

This is the place where the teachers and students of Peking University hold lectures every afternoon, and the speakers are both students and teachers.

"Oh, I'm still writing and drawing, didn't I say that I was going out for a walk, but I didn't see it in the blink of an eye and was secretly busy working."

Under the shade of the tree, not long after Cheng Nuo took out the paper and pen, and before a few formulas were listed, he was caught by Wen Yin.

Holding the tip of the pen and scratching his forehead, Cheng Nuo was a little embarrassed and said: "Hey, I'm not watching you go to the toilet, I'm idle, I'm idle, so I want to improve the matter of the air compressor last time." Not to mention, this time I accompanied you out for a walk, and I just happened to be inspired. ”

"Really? I'll take a look at ......" Wen Yin frowned lightly, bent down from behind the bench and slowly poked her neck, originally a little interested, but when she saw that there were symbols on it that she couldn't understand, she couldn't help but mutter: "That's it on the first date, I like math so much, I just have to go with math in the future." ”

Cheng Nuo didn't hear clearly, craned his neck and asked, "Wen Yin, I didn't hear what you just said." ”

"I mean, you're more interested in math than me." Wen Yinxiu tapped Cheng Nuo's forehead with her finger and wiped off the handwriting left by the tip of the pen just now: "I don't care about myself, how can this be reassuring?" ”

As she spoke, Wen Yin's other hand stretched out from behind her back, holding two rock sugar gourds: "Well, someone just sold rock sugar gourds, I think our Peking University classmates bought a lot, although I haven't eaten their family, but I think it shouldn't taste wrong." ”

Cheng Nuo really didn't know what to say at all, he didn't expect to be a human being in two lives, the first time he dated the opposite sex, he actually bought something for himself by the other party, although he was an emotional idiot, but he also knew that there were some situations where he should take the initiative.

Seeing that Cheng Nuo hadn't reacted yet, Wen Yin thought that the other party had other ideas, so she shook in front of her eyes again: "Zhiyuan, what are you thinking, everything has been bought for you, you can't waste food, maybe you don't like to eat rock sugar gourds, right?" ”

Seeing this, Cheng Nuo said that it was not good, so he hurriedly went to pick up the lollipop gourd.

But sometimes the more anxious people are, the more chaos will occur.

In a hurry, Cheng Nuo grabbed not the rock sugar gourd in his hand, but the hand of the other girl.

As soon as the ground was cleared, both of them blushed.

At this time, Cheng Nuo's thick skin was finally reflected, gritted his teeth and simply made a mistake, continued to push up, grabbed the rock sugar gourd and said: "Thank you for the rock sugar gourd, I didn't mean it just now, I'm really sorry." ”

Wen Yin opened her mouth, just about to say something, but she didn't expect a student from Peking University to come over.

After seeing Cheng Nuo and Wen Yin, some students wanted to take the initiative to come over to say hello, but they were desperately pulled by their companions who reacted quickly.

At first, the student was still a little puzzled, but after his companion whispered in his ear, he suddenly realized, and his face was excited, as if he had discovered something great, and he frowned.

Through the corner of her eye, Wen Yin saw the whole process in her eyes, and all kinds of thoughts such as nervousness, unease, and joy poured out in her heart, and she only felt that her face was hot as if she could fry an egg.

Although Cheng Nuo was also a little embarrassed, he still took the initiative to stand up, blocking between the other party and the students, and arching his hand to those students.

When the students saw this, they immediately put away the smiles on their faces, bowed seriously, and then turned to leave.

After making sure that those students were gone, Cheng Nuo said, "Wen Yin, those students are gone. ”

"Hmm." Wen Yin hummed softly.

In this way, the two looked at each other without saying a word, and continued to wander aimlessly in the park.

As she walked, Wen Yin suddenly asked, "Zhiyuan, what do you say is love?" ”

Cheng Nuo was stunned, couldn't help but glance at the other party's side face, and then quickly took it back: "Soon after Zhuo Wenjun and Sima Xiangru got married, Sima Xiangru immediately went to Chang'an to become an official, and he didn't return for five years, Zhuo Wenjun missed it very much, one day, she suddenly received a letter from her husband, Wen Yin, guess what was written in it?" ”

"Let me think about it......" Wen Yin bit her lip lightly and hesitated: "The love story of the two of them is so classic, I think it should also be the man's thoughts about the woman, right?" ”

Cheng Nuo smiled, and said with words in his mouth: "Actually, the content of the letter is very simple, it is a poem, which reads 'one, two, three, four, five, six, seven, eight, nine, ten million', guess what this means?" ”

Wen Yin repeated the poem several times in her mouth, and said with some uncertainty: "Seven appears twice, and seven has the same sound as his wife, obviously Sima Xiangru has the intention of stopping his wife and marrying another?" ”

As he spoke, he glanced at Cheng Nuo meaningfully.

The situation was not good, Cheng Nuo hurriedly stopped and continued to sell Guanzi's careful thoughts, holding the sugar gourd and said: "You are very right, it is exactly the same as Zhuo Wenjun's thinking, and then Zhuo Wenjun directly picked up another letter, which said-After a farewell, the two places are hanging each other, talking about March and April, but who knows that it will be ...... five or six years."

Cheng Nuo basically didn't have any ventilation, so he read out Zhuo Wenjun's poem, and the number went from one to ten thousand and then from ten thousand to one, which can be described as a hundred turns.

Come down in one breath, and suffocate Cheng Nuo to death in a few strokes.

Listening to this poem, Wen Yin's eyes flickered: "Then how did Sima Xiangru behave after receiving the letter?" ”

"Of course, the more Sima Xiangru read it, the more ashamed he became, and he took Zhuo Wenjun to Chang'an with a horse and a high cart." Cheng Nuo took a deep breath and continued: "The love I thought was of course a very complicated equation. ”

Wen Yin seemed to understand: "What do you mean?" ”

Seeing that there were leaves on Wen Yin's head, Cheng Nuo took the initiative to remove it: "There may be no solution within the range of rational numbers, but there is a solution within the range of real numbers, or there is no solution within the range of real numbers, but it is possible to find the answer within the range of imaginary numbers, and some of the solution processes are still very complicated, and it is possible to get a satisfactory answer only after careful verification and repeated research." ”

Originally, Wen Yin was made sweet by this heart-warming act, but after hearing Cheng Nuo's explanation, she couldn't help but darken her face: "After all, your research on mathematics is a little deeper." ”

Cheng Nuo played with the leaves in his hand, thinking that the other party was still praising him, and continued: "I can only say that I know a little more about mathematics than ordinary people, mathematically in the final analysis, happy love is also simple in nature, you love me, I love you, it's so simple, so symmetrical, so beautiful......"

Just as Cheng Nuo continued to talk at length, he suddenly found that Wen Yin was looking up at him with his head tilted, as if he was smiling.

I secretly felt bad in my heart, and quickly threw away the leaves in my hand, looking honest, as if he was not the one who had just talked about love and had a lot of insights into love.

Looking at each other, Wen Yin was suddenly laughed, and she didn't even know why she was laughing.

Here, Cheng Nuo thought that the other party was no longer angry, and immediately laughed.

"You, the leaves are not dirty, just blow them off, why do you still hold them in your hands?" Wen Yin shook her head, then turned around and walked forward slowly: "Actually, I don't know anything about mathematics. ”

Cheng Nuo was surprised: "For example? ”

Wen Yin lightly opened her lips: "For example, the love I think is a vector, when the direction is determined and the length of the mold is not zero, any translation will not change, that is unwavering love; When the vector is a zero vector and there is no solid foundation, the direction of love is arbitrary, which is the love of watery flowers, which is not worthy of praise. ”

Just as Cheng Nuo sighed and was about to applaud the other party, he suddenly found that his hands were sticky.

It turned out that because I didn't eat it for a long time, the sugar on the rock sugar gourd melted a little, and it flowed down the wooden skewer to my hand.

"Okay, that's the end of the math topic between the two of us, hurry up and eat it, if you don't eat it for a while, it'll all melt into your hands." Wen Yin took the initiative to hand over a handkerchief and asked Cheng Nuo to cushion it.

Looking at the handkerchief, Cheng Nuo was slightly surprised.

And this time, it was also captured by Wen Yin, and he said happily: "How about it, it's still the previous one, see that I'm more diligent and thrifty, right?" ”

Taking the handkerchief, Cheng Nuo couldn't help but bow his head and cover his face, but the laughter couldn't be stopped, and the laughter was like a pig's cry.

Is there a confession, in fact, it doesn't count, from acquaintance to love, two people almost come naturally.

True love is mostly two-way, just like Cheng Nuo and Wen Yin.

didn't say how much they swore to, most of them were trivial and ordinary lives, thinking more about each other, everything was in silence, and I couldn't say when the two would formalize their relationship, they only knew that they had each other's place in their hearts.

"Hey, Zhiyuan, why do you think my rock sugar gourd is sour?" Wen Yin held half a string of rock sugar gourds and said with some doubts.

"Really? Let me see. Cheng Nuo curiously took the half string of rock sugar gourds, looked left and right, and finally took his own gesture and said: "These two don't look like any difference, why do you become sour?" ”

"If you don't believe it, then you can try it." Wen Yin blinked her long eyelashes and encouraged.

Cheng Nuo hesitated slightly, and then took a bite, this time it was really strange, the remaining half of the rock sugar gourd was not only not sour, but also sweet.

Suddenly reacting to what was going on, Cheng Nuo instantly turned his gaze to Wen Yin: "This is ...... Sweet. ”

Wen Yin immediately smiled like a flower on her face: "Of course, the rock sugar gourd I picked, how can it be sour, you usually have a big appetite and eat so much more than me, so we don't have to divide it equally on what we eat, and the rest is your ......."

For a moment, Cheng Nuo didn't think about it, and directly hugged Wen Yin in his arms: "You are so stupid." ”

Wen Yin only broke free a little symbolically, and then muttered: "In public, you know how to play hooligan......"

However, Cheng Nuo also knew that it was not a private place at the moment, and some of the actions were up to the point, and the two separated without too much warmth.

"Zhiyuan, will the focus of your future work still be on mathematics?" Wen Yin said with some concern.

It is already November in the public government, and the weather is already relatively cold, Cheng Nuo will hold Wen Yin's hand with both hands, and warm his small hands with his big hands: "If you want to win a glimmer of hope for the future national industry, you can only put the matter of mathematics first." ”

Wen Yin was puzzled: "Why? You are so talented in mathematics, and your future achievements are definitely more than that, and there are so many people who do national industry, is it really so urgent? ”

Rubbing his hands gently, Cheng Nuo said: "If we don't want to be Japan's industrial vassal, we must take the road of independence as soon as possible, otherwise it will be difficult to return in the future, and it will be difficult to recover." ”

In the early years of the Republic of China, China's new iron mining industry developed rapidly, but this was not due to the need for more iron ore consumption in the domestic steel industry, but more because of the demand for iron ore in neighboring Japan.

Even after the First World War, the world's demand for steel plummeted, and even Hanyeping, the largest domestic iron ore consumer, stopped steelmaking and ironmaking, but the total output of iron ore enterprises did not decline significantly, and remained at the level of 1 million tons per year.

The reason for this is that China's iron ore production has been incorporated into Japan's steel production system and has become a vassal of Japan's steel industry. The result of this dependence is dangerous, leaving China's steel production completely at the mercy of others.

In the future, on the battlefield of resistance against Japan, it can be said that the shells that hit us on our heads are likely to be pig iron resources from our land, how cruel it is.

To be sure, iron ore and pig iron are not inaccessible to international trade if they are purely for business, but the problem is that the relationship between buyers and sellers is too unequal to adjust to the same degree as steel market price fluctuations.

For example, in the last year of World War I, the price of pig iron in Japan rose by 357 yen by 8 times that of the pre-war period, but the average price of iron ore sold by us only increased by 19 yen, which is obviously extremely unreasonable.

"How difficult is it to find an independent path?" Wen Yin muttered to herself: "No wonder you are now focusing more on industry, compared to mathematics, the national industry needs your help more, but the disadvantages of steel development, are we the only ones who have seen it?" ”

Cheng Nuo shook his head with a wry smile: "Of course not, it's just that when a person is about to die of thirst in the desert, a cup of chronic poison suddenly appears in front of you, what will you choose to do?" ”

Wen Yin replied: "If you don't drink it, you will die immediately, and if you drink it, you will die slowly, so it's no wonder that everyone chooses this path." ”

Cheng Nuo said with a smile: "Therefore, what we have to do is to give the national industry one more way to create more demand, with these needs, everyone will have more choices, and development can have diversity." ”

Wen Yin nodded: "You don't have to worry about it, I will always support you in the future, but I have one request." ”

Cheng Nuo was curious: "What requirements?" ”

Wen Yin shook the powder fist in his hand: "That is, you can't write me mathematical poems!" ”

Cheng Nuo laughed after hearing this, and rubbed the other party's little hand dotingly: "Of course it won't, but I have an equation for you." ”

"What?"

“ρ=a(1-sinθ)”

In the back, no matter how Yin asked, Cheng Nuo refused to decrypt it, and it happened that Mr. Hu's arrival brought this little episode over.

(End of chapter)