north bird south

……

In a few months, Yu Yao will have taught in Jiming for a full year.He also thought that he could stay forever, because he likes this place, and when he walks on the road, he will occasionally bump into a scene that surprises him at a certain corner, like the ginkgo tree in front of Classroom No. [-] in Autumn—when he came, I will leave at this time, but it is a pity that I cannot reincarnate for four seasons.

He sat on the steps outside Classroom No. [-] in the morning, listening to the music students who usually practiced there playing the piano. Occasionally, a few students recognized him and bowed to say hello.

Yu Yao waved his hand slightly to let them continue.What they played was "Farewell", and they hit the scene right on the ground.Yu Yao hummed along with the tune in the piano sound.

The leaves above the head were in full bloom, and suddenly I heard chirping birds. When I looked up, I was dazzled by the sunlight leaking from the cracks in the leaves. When I stretched out my hand to cover it, a small black shadow had already spread its wings and flew across the leaves.

This made Yu Yao suddenly think of the phrase "the song of the birds is the echo of the dawn echoing from the earth" that he once saw in Yue Jianliu's notes.

He smiled, looked back, and continued to look at the youthful students not far away.

He estimated that the time was coming, and when he stood up to tidy up his clothes, the time was right. He picked up his briefcase during the bell and walked slowly through the crowd to the classroom he went to most often.

Xu Zhiyuan asked for leave to go on a "date" with Meng Miaochang - he asked for leave unscrupulously relying on the teacher's ability to give him face-to-face make-up lessons at any time, and he has become a rare visitor in the classroom.Yu Yao was worried about this kid, grades are the same thing, his attendance this year probably won't meet the standard.

Except for Dong Yibai, Xu Zhiyuan, and Cao Xiangfan, who hadn't been seen for a long time, the classroom was full of people today, and Yue Jianliu also had time to attend class.

Yu Yao taught as usual, and the students were used to his gentle voice, and they didn't notice any difference from before.

After finishing the last line of the lesson preparation record, Yu Yao closed the notebook and suddenly said that the students should do the questions.

Pointing to the four people who raised their hands scatteredly, Yu Yao wrote a few sets of formulas on the side of the blackboard and distributed them to these students.Then he said: "You use these formulas separately—you can only use your own formulas to solve this problem in the textbook."

In Yu Yao's class, there are always "new activities" from time to time. When the people below and the people in front of the blackboard heard what he said, they immediately became interested.After seeing the page numbers of the textbook written by Yu Yao, there was the rustling sound of flipping books in the quiet classroom.

Yue Jianliu didn't have any textbooks, but a classmate he knew pushed his own to her, and the two shared them.

This is a "proof question" that is not of a testing nature.

The conditions given are "a dazzling array", and the result is not a specific number, but an obvious conclusion.It's like giving travelers a destination, and they choose the means of transportation to go to the other side of the Pacific Ocean.The purpose is to arouse the interest of scholars by connecting the previous chapters and the next chapters. Generally, the past is ignored in class.

The formula of the male student who once told Yu Yao about his ideals was the most direct one, so he went back and wrote a solution on the blackboard. He only used a conditional number to substitute in, and after a short calculation, he wrote the proof. .

Xia En scratched the back of his neck with a headache, picked from his set of trivial formulas, and sorted them out.Since the rule set by Mr. Yu is to use only "his own formula", he rubbed it several times unaccustomedly before finishing the comparison and writing the proof.

And the female student next to him also has many formulas in her hands, but it is different from Xia En's. In addition, this girl's foundation is very solid. She can see how many fractions she has formed, and after substituting the deformation, she can get the general formula of the first group. up.

She didn't know that "the talisman does not conform to the rules", so she subconsciously glanced at Yu Yao, and Yu Yao said softly, "As long as it is made with the tools in your hands, it's fine."

So the girl confidently picked up the pen, and after she had the general formula, the steps of the proof were the same as those of the first male student, and she wrote "the proof is complete" concisely and clearly.

The last tall boy looked at his formula in embarrassment, and did not start writing in front of the blackboard.The students below can see everyone's formula, so they know his situation well, and they can't help laughing.

The tall man smiled wryly and said, "Mr. Yu, this is a question about quantum mechanics. The formula you gave me is Newton's three laws... It's useless."

Yu Yao said calmly: "Then you have failed to solve the problem."

The tall man wailed sadly: "...it's not fair, I can't do it at all."

He is probably the most popular star in the class, and his embarrassed expression provided a joke for the friends in the seat. Someone laughed and joked: "You write a few strokes quickly, maybe you can rewrite the physics book."

"Stand on the Nobel Prize!"

"Hahaha……"

"..."

After all, he didn't dare to "blaspheme" the textbook amidst the booing, and only wrote a horizontal and vertical "solution"—and a colon.

The dumbfounded tall man stood with the three who had finished writing amidst the "laughing" and watched Yu Yao press his hand to signal everyone to be quiet.

Yu Yao turned around and wrote another topic on the blackboard. His writing on the blackboard was neat and beautiful. Some of the young people who couldn't wait stood up and stretched their heads to look at it. What Yu Yao wrote was exactly the same simple machine. Exercise proof questions.

"You guys do this again."

This time, only the tall boy among the four completed the answer.

Yu Yao asked: "Is this 'fair'?"

The tall man only raised his eyebrows, but didn't answer.

Everyone seemed to understand what Yu Yao was going to say, and started whispering.

"You have all seen it," Yu Yao pointed to the four different handwritings on the blackboard, and said, "The school taught you thousands of numbers and symbols. How to combine them and how to use them is up to you to decide."

"You will all have your own unique formulas and steps in the future, none of which are useless." He turned his head to look at the tall man, and said, "Right, classmate Wang."

The tall boy rubbed the tip of his nose with a laugh, and explained softly: "I'm specifically referring to that problem, and I don't mean that Newton's old man's calculations are useless."

Yu Yao smiled helplessly, patted him on the back, and said to the four of them, "Go back and sit down."

Yu Yao stood back on the podium again, and was watched by the shining black eyes. He said: "I hope that after three years, you will not just sit and watch the sky, but be busy with money and life. There are countless distant places outside the mouth of the well, and countless people. .You have the responsibility to use the formula taught to you by Zhiming to solve the most suitable and ideal steps—it doesn’t need to be great, just worthy.”

"Maybe it's a bit old-fashioned," Yu Yao smiled, "That's what I want to tell you."

Yue Jianliu, who had been carefully watching all this, suddenly applauded, and the whole class went on for a long time.

"This is the last lesson I will teach you," Yu Yao said, "I hope you all have a bright future."

"..."

Like a rainstorm that suddenly stopped, the classroom became silent in an instant, only the bell for the end of get out of class rang as scheduled.

"...the last class?"

Xia En stood up and asked, "Mr. Yu, what do you mean? Are you going to leave?"

"Leave tomorrow."

Sure enough, the voice suddenly exploded, and they asked incredulously and eagerly.Yu Yao could only hear a loud sentence from the rush of tongues.

"Why are you leaving?"

Yu Yao didn't know how to answer, seeing the smiles on a few familiar faces gradually froze, he didn't dare to linger on them for a while, so he could only respond with a calm smile: "Because of business. "

The students didn't believe it, especially Xia En and other students who knew the inside story. They thought that Cao Xiangfan was making trouble again, so they said in unison: "Mr. Yu, we believe you. If the principal misunderstood us, we can prove..."

Yu Yao thanked them for their simple kindness, and the drafts he had typed in his heart stuck in his throat, and he couldn't pour them out.

He could only calm everyone down first.

He originally planned to tell them that he would arrange a farewell banquet at Chinachem tomorrow, but at this moment, there were hurried footsteps outside, and the classroom door was roughly kicked open.

The students were stunned when they saw the group of people in police uniforms outside, while Yu Yao suddenly frowned.I heard the leading police officer say in a rough voice: "Is Yu Yao here?"

Yu Yao stood up from the stunned students, and said calmly, "It's me."

The police officer glanced at the "Notice" in his hand, then glanced at Yu Yao, and said, "Someone reported that you formed a gang to beat students, spread rumors to attack the Huai City authorities, and colluded with fellow clubs to secretly carry out illegal activities that endangered society... …Multiple charges are shared, and now we are going to open a case.”

After he finished speaking, without waiting for anyone to open his mouth to refute, he pointed at Yu Yao with his chin, and ordered: "Catch it."