Guzhang Street.

It was already half past six when Su Can got home, the sunset burned the sky red, the gray and white unit buildings were gilded with a layer of golden red by the setting sun, and the branches on the side of the road cut the sunset, sprinkling the crumbs of light on the gold-dyed ground.

Some aunts moved out of their small benches and went to work in spacious places, or pick up vegetables, or sew clothes, or coax children.

The men often squatted on the stone platform under the shade of the courtyard to play chess, surrounded by a large group of old and young masters, and there was a small quarrel and the crisp sound of chess pieces hitting on the stone platform.

The children of the employees of the compound are in a pile of three, and the five young men are mixed together, kicking the athletes, playing with sandbags, or hiding cats, and from time to time there are giggles, which is definitely a warm scene.

Su Can said hello to the old man Xia, who had the best relationship with him, and returned to his unit.

Walking into my own unit, I threw my schoolbag on the table, and the red, blue and white school uniform jacket hung on the hanger.

Su Can could feel the cool summer heat that was different from autumn.

"Where have mom and dad gone?" Su Can saw that the house was quiet and a little strange, so he called twice, but did not respond.

It is estimated that in the study of the bedroom office, only the house has good sound insulation, and you will never hear the outside sound when you stand inside with the door closed.

Su Can's parents have been teachers for more than ten years, and when the house was small, the writing desks were placed face to face, sitting on one side, reading books, preparing classes, and writing papers, making the home look like an office.

Later, I moved into a new unit and replaced it with two new desks, one in the study and one in the bedroom, the one in the study was for Su Can, and the bedroom was used by Su's father and Su's mother.

Su Can glanced at the open door of the study, and saw his father and mother sitting side by side in front of the writing desk placed against the wall, his father was reviewing the students' essays, and his mother was holding a pen and a pile of paper, practicing pen calligraphy, and the two were busy with their own work.

Looking over from his angle, he only saw the backs of them sitting side by side shoulder to shoulder, Su Can felt that it was the so-called happiness, although he couldn't see their expressions and thoughts clearly.

They seem to have sat like this all their lives, from youth to middle age, and from old to young......

So simple, so quiet, busy with the little things in front of me, I don't care when it started and when it will end.

They couldn't see themselves, they didn't turn their heads to look at each other, and they didn't notice Su Can standing far behind them.

Su Can held his breath and slowed his steps, for fear that in the blink of an eye, the warm picture would disappear from his eyes, turned around, and left quietly.

※※※

Dinner was still three dishes and one soup, and he didn't add any good dishes because Su Can came back, and during the meal, his father Su Chengye asked a few words about Su Can's start of school today.

Su Can twisted a few interesting things and told his father, when his homeroom teacher was called Yang Xiaomin.

Su Chengye squinted his eyes and thought about it, and the chopsticks tapped lightly on the edge of the rice bowl, and then shook his head and chuckled.

"I'm going to take the exam tomorrow, so I'll go back and read the book." Su Can and Su Chengye, Lin Anqin said hello and returned to their study.

The light bulb in the study emitted a pale yellow light, and Su Can was lying on the desk, which was full of English, mathematics, physics, and chemistry, which were placed in a mess.

With a sweep of his arm, he pushed all the books on the table aside, and then held a gel pen in his hand, supported his cheeks, and reviewed the knowledge points of the first year of high school in the dim light.

He looked at the gel pen in his hand and smiled, fortunately, in 1998, the gel pen was already very popular in the country, otherwise he would not be used to the days of using ballpoint pens.

Reading in a different position, the tip of the pen was also bitten in his mouth.

Su Can feels that high school mathematics is slightly more difficult than physics, but the difficulty is not much different, if you want to learn mathematics and physics well, you have to learn to integrate and understand the example problems thoroughly, so that you can draw inferences from one another.

Formulas do not need to be memorized, and they are naturally very proficient when they are used more, mainly to pay attention to accumulation, pay attention to their mistakes, and review them from time to time in order to learn mathematics and physics well.

"Let's find out the key points of tomorrow's test first, and then I'll remember it well, and I'll hold on to it temporarily."

In his freshman math book, he used a red pen to mark the key points needed, sets and simple logic, inequalities, and functions.

Atomic structure, halogens, chemical bonds, and crystal structure are marked in chemistry books, and the three laws of kinematics, mechanics, and Newton are marked in physics books.

Su Can began to bury his head in review, fortunately, the knowledge of the first year of high school is not too difficult, as long as he seriously reviews for one night, he doesn't have to worry about his grades being too bad tomorrow.

In addition, he has the memory of an adult, and he is also very good at doing the test questions, and he quickly brushes a test paper.

"There is only one straight line parallel to the known straight line at a point where it is known, and it is verified: there is only one and only one straight line and parallel at the point of crossing?" Su Can stared at the math problem, rustling on scratch paper with a pen in his hand.

Soon the sketch was drawn, Su Can frowned and thought, and worked hard to analyze and verify without turning the book.

"The analysis of the meaning of having and only means that there is and only is the same, and therefore there are two aspects to be proved here, namely, existence and uniqueness."

"Existence zài, that is, proving that the object that satisfies the condition is existing, uniqueness, that is, proving that there is only one object that satisfies the condition, well, in other words, it is said that there is no existence zài second object that satisfies the condition, therefore, this is a negative proposition, and the method of counterproof is commonly used."

"Proof that a plane can be determined ∵ a plane known by the knowledge of plane geometry, and that in memory there are points and parallel straight lines; Uniqueness, supposing that there are two straight lines at the point of space crossing, satisfying and straight lines, according to axiom 4, there must be contradictions, ∴ straight line passes through the point there is one and only one straight line and parallel. ”

Su Can's hand drew dazzling lines on the scratch paper, and wrote down a bunch of proofs, and finally calculated and proved this classic question.

If the math teacher He Jun was here, he would be very shocked, because this is a classic math example problem, and many students may not be able to do it.

Even if you are the top student in the class, you have to think about it for a long time, and after countless verifications and speculations, you can solve the problem.

Su Can felt that the thought in his head had never been clear, every symbol, every number was beating in his eyes, and the logic was clear, and he could quickly find out the accurate information from a bunch of trap words.

"How does that feel?"

Su Can was pleasantly surprised, felt his heart throb, and stopped beating.

Even the air seemed to become congregated.

Bang! There was no sound, only the beating of the heart echoed in my ears.

Su Can frantically opened the language book of the first year of high school, turned to the "Persuasion", saw the three hundred and five crosses of classical Chinese, and then read it quickly at a glance and ten lines.

"Mountains of soil are accumulated, and wind and rain are prosperous; The water becomes an abyss, and the dragon is born; Accumulate goodness and become virtuous, and the gods are self-satisfied, and the sacred heart is prepared for ......"

Close your eyes!

Concentrate on memories.

A familiar throbbing spread like a tide in my heart.

The heart "thumped" and "thumped" beat a few times.

Then he opened his eyes in ecstasy, and a bright look appeared in his brown pupils.

"The gentleman said: You can't learn, green, take it from the blue and green from the blue; Ice, for which the water is cold and cold...... The soil is a mountain, and the wind and rain are prosperous; The water becomes an abyss, and the dragon is born; Accumulate goodness and become virtuous, and the gods are self-satisfied, and the sacred heart is prepared for ......"

He accurately memorized the classical Chinese of "Persuasion" in a very short time, and those ancient texts seemed to be deeply imprinted in his mind.

I didn't expect to go back to the past, and I actually carried such a special ability with me, which can remember what I have seen in the shortest possible time, which is just like those geniuses who have never forgotten.

How not to surprise Su Can?

Life is like fire and ice, we go all the way, just for him on the road that lingers day by day, looking back, there is a landing point in his eyes, and that landing point is often when he first sees in life, who reads the west wind alone and is cold...... At that time, it was just ordinary.

originally thought that those once good pasts had become regrets, but God gave him the opportunity to start again, and he couldn't live an ordinary life like this.

"This is my 1998, the past, no need to be nostalgic, just strive for the present, no regrets." Su Can looked at the stars outside the window and whispered to himself.