heart to wild

Chapter 69 The Fourier Transform

When trigonometric functions were mentioned again in math class, Teacher Song Ran suddenly asked everyone: "Do you know who Fourier is?"

Just finished the academic proficiency test last month, and the students who said goodbye to physics completely booed: "Teacher, why do we feel that you are in Cao Ying and your heart is in Han!"

The last time I asked about the radius of the earth's rotation, this time I asked them about heat transfer experts.

Song Ran ignored them, turned around and wrote down a series of complicated trigonometric formulas on the blackboard, and lazily replied: "You guys are too ignorant. Acousto-optic oceanography and other fields have a very wide range of applications."

It's amazing that you can list so many applications of it in a row!

Fourier's transform and inverse transform both make people bald. Song Ran changed the two letters into constants and invited students to start derivation.

Happy teaching is so unexpected.

But they all liked this senior who happened to be ten years older than them.

Listening to Song Ran's math class is completely different from listening to Zhang Yifeng's class. The young teacher's thinking is active, and he even jumps a little bit. He often makes a question just after he finished his lecture, and then jumps to another new question type that is impossible to solve. matter.

But he was funny and good at motivating students' thinking. After more than a month this semester, even Zhou Zhou began to feel that mathematics was not so difficult to start with.

After all, they were only the third batch of students under Song Ran's leadership.

The last time he had too little qualifications, he was taken to the second year of high school by the leader and stayed in the second year of high school for another year.The former classmates hated him and asked the parents to go to the principal together, but in the end they failed to let him continue to take the children all the way to the third year of high school.

In the past, no one dared to take the risk of graduating students to test him, but this year is different. President Peng personally said that Song Ran will accompany Class [-] until graduation.

But recently, the teachers with "Ran" in their names seem to be a bit Mercury retrograde.

In addition to class three, Song Ran also took another mathematics class of class seven of liberal arts. On Thursday of this week, several parents of class seven went to the principal's office in a team.

It was still for Teacher Song, but this time it was not for keeping him.

Song Ran asked for leave.

When Zhang Yifeng walked into Class [-] classroom again, what greeted him was deathly silence.

The man raised his eyebrows and said lazily, "Is this how you usually welcome your Teacher Song?"

Tang Miaomiao immediately shouted: "Stand up."

Everyone got up as if waking up from a dream, and the tables, chairs and benches rubbed against the ground to make a clank.

"teacher--"

"Okay, okay, okay," Zhang Yifeng helplessly raised his hand to push them back, "It's not possible, he is not feeling well and asked for a leave of absence, not a suspension."

The class representative, He Dan, was about to cry, for his adrift and unreliable career.

"Mr. Zhang, what's wrong with Mr. Song?"

Zhang Yifeng leaned on the desk and flipped through the math books, his eyelids drooping: "Acute appendicitis, it will come in a few days."

Xiao Linzi raised his hand: "Then can we go see him!"

"Do whatever you want," Zhang Yifeng raised his eyebrows and glanced at the forty or so children, "but don't go all at once, just go to one or two representatives, it's scary."

It's not terminally ill.

After class, He Dan took the lead and rushed to the door of class seven, grabbing the canteen that was about to leave from the back door.

"Your class parents said something bad about Mr. Song!"

The little boy had a bitter face, and was very puzzled why he was the one who spoke for the class every time: "I don't know, and my parents didn't participate."

He also likes Teacher Song very much.

Xiao Linzi, the half-brother of the canteen, stood on the door frame and looked around at the students in Class [-], seeing that no one was pleasing to the eye.

Yu Dian stood beside him, crossing his arms unhappily: "Whose parent is that? Call us out and let's confront each other!"

They were a large group of menacing people. The next physical education class of Class [-], there were not many people left in the class, and it seemed that they were weak.

I used to like Yu Zisheng but now I think he is just a stick, the Class [-] girl came out, folded her arms, and said unhappy: "Do you want to fight?"

Zhou Zhou raised his head: "Don't put your hat on!"

Ban Hua pointed to Yu Zisheng who was lazily leaning against the opposite wall behind them: "Then why did you call him here!"

The bully standing here is not threatening or provocative!

Yu Dian was even more unhappy: "Who said he is a school bully!"

He is sweet as hell!

Ban Hua stared: "Everyone can't see it!"

He Dan: "...Brother, sister, the topic has gone far."

Yu Zisheng grinned, walked over, raised his long arms, and patted the top of the door frame gently.

There was a crisp sound of "pop", and the corridor was quiet.

He said lightly: "So whoever the parent is, what did you say to the principal about Mr. Song?"

Hold.

You are not a school bully who is.

Amidst the silent threat from the school bully, everyone still learned the truth of the matter from the mouths of the remaining Class [-] students.

Probably some parents were dissatisfied when they heard that the school would let young teachers continue to take care of their children in the third year of high school. They wanted to talk to the principal, so they investigated Song Ran in advance.It's okay if you don't investigate, but it will be terrible if you investigate, good guy, this person actually framed his classmates for cheating when he was in high school!

There is a problem with character!How can I teach children!

"What nonsense are you talking about!"

The three classes of students said in unison that they were about to explode.

"If you don't believe me, ask Mr. Song yourself..."

The students in class [-] have no confidence and are scared to death.

Just ask.

At noon that day, He Dan ran to the Gastroenterology Department of the People's Hospital with a large bag of fruit at the request of his classmates, and asked this question as a joke in the ward.

No one believed that Song Ran had ever framed a classmate. Everyone felt that the teacher was wronged, even the vast majority of Class [-] students thought so.

But in the ward, after He Dan finished hahaha, the air fell into a suffocating silence.

He Dan's smile gradually froze.

"Teacher Song..."

Teacher Song twitched the corners of his mouth, his face was still pale after the operation, and his single eyelid without glasses was very thin, making it difficult to smile.

"It's true," he said.

"Do you still remember the good friend I mentioned who didn't dare to say happy birthday to him? That's him, my deskmate."

Song Ran grinned miserably: "He is also the representative of the mathematics class."

So when filling out the volunteers, Song Ran, who decided to apply for the normal school, finally chose the latter between physics and mathematics.

But maybe he really doesn't deserve to be a teacher.

Although the teachers back then forgave him, and even the dean who became the principal was willing to let him continue to lead the third year of high school, the person he framed, and himself, did not forgive Song Ran back then.

No, he still had his father's surname at that time, Jin Ran.

"It turned out to be like this".

He Dan returned to school in a daze, and was surrounded by classmates who were chattering around in his seat, making his head dizzy from arguing.

"It's true!" he yelled.

"Teacher Song said it was true!"

Although there is no record file, no public punishment, the parties involved and the teacher who dealt with it tacitly kept silent, but there are always gossip mouths who can tell the truth as false, and the false as true.

The popular Song Ran is actually that annoying Jin Ran, and he can't hide it for long.

In silence, Tang Miaomiao calmly tapped the table with his index finger.

"People are not sages. We don't know the reasons for what happened back then, so don't think too much about it. Look at the present, right now, you all still like Mr. Song, do you want him to continue teaching us?"

Everyone looked at each other for a long while, and the first person nodded, and soon everyone replied vigorously as if infected: "Thinking about it!"

Is there anyone who hasn't done anything wrong?

Moreover, adults are not necessarily as humorous, stable, or philistine as they appear on the outside.

Returning home from school, Yu Zisheng passed by the newly built coffin downstairs.

Do you still remember the very beginning of the story, the neighbor Aunt Zhang that Yu Zisheng and his mother met on the side of the road before the high school entrance examination?

She gossips, speaks badly, loves petty gains, and is a standard "little citizen". The only and most special character is probably that her son who is a very good student is a giant baby and mother.

The mourning shed was set up for Aunt Zhang's father, and the neighbors all went to have a glass of wine and helped out.

In the evening, when Yu Zisheng went downstairs to pick up Tong Qiyan who was helping to print paper money, he happened to hear Aunt Zhang and his mother showing off to people how many banquet tables they would set up at the Crescent Hotel tomorrow, and how many cars there would be for the old man in the morning .

How could there be such a person.

Yu Zisheng couldn't help frowning, but Tong Qiyan held his hand and shook her head slightly.

There is still a thick stack of paper to be printed. Although civilized sacrifices have been advocated in recent years, as a child, who would be willing to have their parents suffer from lack of money there.

Tong Qiyan didn't leave, Yu Zisheng stayed with her, and finally sat next to her, helping out together neatly.

Before leaving, Tong Qiyan went to say goodbye to Aunt Zhang. In the coffin shed, the women who were bragging not long ago hugged each other, crying very, very sadly.

They have no husband and father.

"Humans are very complicated creatures." Tong Qiyan told him.

After speaking, he reacted and asked him: "You don't study biology now, can you understand what I'm talking about?"

Yu Zisheng pinched her shoulders speechlessly and pushed her downstairs to his house: "I think what you said just now is more suitable for liberal arts students to interpret."

Tong Qiyan smiled, turned her head and asked him in the night: "Aren't you going to be a sports student?"

At the end of last semester, class teacher Zhang Fu and coach He of the basketball team met with her before the parent meeting. After returning home, Yu Zisheng also mentioned to his parents about playing basketball professionally.

To be honest, Tong Qiyan was stunned at the time, but she really didn't expect it.

She is used to the idea of ​​taking the high school entrance examination and college entrance examination in a straight line. Even if Yu Zisheng does become a chef in the end, he will still pass the college entrance examination to New Oriental.

Sports special move, I will play basketball in the future.She hadn't thought about it at all.

But Teacher Zhang told her that the children all said that Yu Zisheng really liked playing basketball.

When she got home, Tong Qiyan had actually figured it out.

The son didn't speak by the door, but she took the initiative to smile and said: "Just make a decision, and Mom and Dad will support you."

Go to the NBA, or become a physical education teacher or fitness coach, it's up to you.

As long as you like, you can.

But their parents were well prepared, but their son is still hesitating today.

The elevator was going down from the top floor, and Tong Qiyan stood in the hallway and pushed her silent son teasingly: "Hey, Yu Zisheng, why are you a mother-in-law?"

She writes children's dramas, and she also has a good understanding of the minds of teenagers, and she suddenly felt blessed: "You won't fall in love early!"

It is already the second half of the second semester of senior high school. If Yu Zisheng decides to take the path of being a sports student, his training will be much harder than other students who started earlier, and there will be a lot of preparations-he will not be If you are in a relationship, you are afraid of a long-distance relationship in the same school!

Yu Zisheng looked at his whimsical mother in disbelief: "I'm almost nineteen, not a puppy love."

Tong Qiyan also looked at him inexplicably: "Everyone talks about themselves, why don't you just say that you are twenty years old?"

Forget it, after all, the partner is still at the age of puppy love, saying that he is too old is like eating tender grass.

"I'm really about to fall in love," he said.

Tong Qiyan: "...?"

The elevator door opened, and Yu Zisheng walked in, holding the woman's shoulders.

"But I'm not just for him."

silly mother.

Yu Zisheng said: "I will report to the coach starting tomorrow, and I will apply for boarding on campus next week. Don't miss me too much."

"..." Tong Qiyan slowly raised her head to look at her son's beautiful jaw line, her tone was a little unnatural.

"Do you still have to live on campus to be a sports student?"

Yu Zisheng raised his eyebrows: "Otherwise, the training leaves early and returns late, and our house is not too close. Let me sleep more, Mom."

Who won't let you sleep.

Tong Qiyan broke away from his paw, frowned and patted her son's forearm, thought for a while, then stretched out her hand to rub it for him.

"...Are you coming back this weekend?"

Yu Zisheng raised the corners of his lips, and held his mother's soft hand behind his back.

"Always come back," he said.

In the new week, Teacher Song Ran's wound hadn't healed yet, and Zhang Yifeng, who was still stinky, came to substitute for them.

During the lunch break, Yu Zisheng was rarely absent, and the few boys left in Class Three gathered together in the back row of the classroom, chattering.

Yu Dian said, "Do you still remember Luis+'s boss?"

They met when they went to the coffee shop to pick up cakes on the young lady's birthday.

He Dan, who was bullied by the boss, was deeply impressed: "Remember, the boss forced one."

Yu clicked "Yeah" and said, "In addition to the boss, we also met another customer wearing sunglasses, do you remember?"

Zhou Zhou squinted his eyes: "I seem to have a little impression... Another handsome guy."

A cultural desert means a lack of words.

Yu nodded and said seriously, "I think they are all high school classmates of Mr. Song."

Wang Haolin, who was busy sending Tang Miaomiao WeChat at that time, didn't remember: "Can you remind me again."

Yu Dian looked at the man who had mixed in from the science class speechlessly, and recounted the scene at that time.

——Song, Ran?

--do you know?you do not know.

— Do I know you?I do not recognize.

——Children, we don't know your teacher.

Wang Haolin remembered: "Ahhh, you said that uncle who talked about cross talk!"

"...It's not necessarily uncle," Yu Dian scratched his head, "I think that handsome guy is very young."

He Dan pondered: "You said that..."

Wang Haolin frowned: "When they were in school, their homeroom teachers seemed to be Teacher Zhang..."

Zhou Zhou said "I'm sorry" and said slowly: "These people can't really be classmates!"

Xiao Linzi was confused: "Who are you talking about?"

Yu Dian patted him on the shoulder: "You will know after school!"

Because after school, they rushed to take a taxi to the Luis+ Cafe on Zhongyu Road.

In the Internet age, people’s memories are like goldfish. Once the popularity of the “Internet celebrity cafe” passed, Luis+’s customer traffic was obviously much less than before.

But the location here is good, the food on the menu is also high-quality and cheap, and the public reviews are full of sincere five-star reviews.

A stuffed camel is bigger than a horse. If they hadn't come at such a tricky time, there would be at least [-] customers in the store every day on weekdays, which is much better than the small broken ice cream shop at the gate of the school that closed down just half a month after it opened. .

The boss is not here today.

I heard him say that the bar is the main business and it’s just a side business, but I didn’t take it seriously, but I haven’t seen him for several times since Yu Dian, the big boss has completely forgotten his side business!

The boys ordered cakes and drinks dejectedly, murmuring how to ask the clerk for the boss's contact information later.

As soon as I thought of PLANB, the wind chime by the door rang.

Yu Dian looked back very sensitively, but what he saw was neither the boss nor the customer wearing sunglasses that day.

But he couldn't look away.

Very casual formal attire, feet on domestic white canvas shoes, black hair cut short, peach eyes, born with a kind smile.

"Wow, Mr. Ji! Are you here to buy cakes?" The clerk's little sister was super enthusiastic.

The young man nodded, his eyes curled up like an upside-down moon, and his voice was pleasant.

"I'm passing by after get off work, do you still have chestnut mousse?"

"There are some."

The little girl bent down and lowered her head to take out the last dark brown mousse cake for him from the cupboard. While wrapping it, she chatted to the man with her colleagues: "You and Mr. Gu haven't been here for a long time, lady boss After the studio moved, the boss didn’t come either!”

"We feel like orphans now! Self-reliant!"

"It's so exaggerated," the man smiled with his lips hooked, "Then I will come here often in the future."

He knows the boss!

This time it's not just about ordering, the young boys at the table all turned their heads suddenly, and all looked at the man standing in front of the bar with piercing eyes.

Although I'm used to being stared at by others, it's still overwhelming to see such enthusiastic eyes cast on me.

The man blinked and tilted his head to look at them, but there was a dimple on his right cheek.

Although the color of the school uniform has changed, the nameplates on their chests are still easy to recognize.

Ji Wanxuan raised her eyebrows: "Little friend, is it in your letter?"

The children nodded vigorously.

Ji Wanxuan pursed her lips, narrowed her eyes slightly and raised her head, smiling and looking back at the little girl who packed the cake: "These are my juniors, I'll invite them to their table, and put it on the account. "

Isn't that recorded on our own account!

The clerk's little sister had slandered, but couldn't help being bewitched by his smile, and responded again and again.

"Okay, okay, I hope we will lose money as soon as possible, so that the boss will think of us."

Ji Wanxuan took the cake, and put the big red Mao Zedong coins in his pocket on the glass cabinet, with a smile on his lips: "Just kidding, I just snatched it from the bank, just steal from the rich and give to the poor."

Run the train with your mouth full.

The phone rang, and it was Shen Fang who asked him where he was going, and he was already in the restaurant.

Ji Wanxuan returned the message and walked out the door, but was suddenly stopped by the children at the table just now.

"Senior!"

Someone stood up and yelled.

Are you calling yourself?

Ji Wanxuan blinked her eyes and turned her head, and unexpectedly saw a super cute little boy standing on the seat, staring at herself with round dog eyes, and asked him super seriously: "Are you the math class representative of your class? "

Ji Wanxuan: "... eh?"

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