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The sound of the self-heating rice grew louder and louder. Le Zhishi turned around and mouthed to Jiang Yufan, "Why is there a sound?"
Jiang Yufan shook his head frantically and mouthed back, "I don't know either …"
Hu Xuan turned around from the front seat. She raised her hand and drew a cross in front of her chest with a mournful expression.
However, Song Yu seemed to be isolated from the world. He did not react at all. He had even drawn half of a mind map on the blackboard. Behind him, the students in the class held back their laughter and put on a wonderful pantomime. The only accompaniment was the sound of the self-heating rice. It was comparable to the increasingly passionate symphony in the Golden Hall.
Not only that, but the experience was in 4D. Steam and the aroma of shredded pork floated out of Le Zhishi's drawer.
He had wanted to eat secretly, but now, the whole class, including Song Yu, knew that he was cooking.
Le Zhishi gave up completely. In his mind, he had already imagined himself being chased out of the classroom and squatting in the corridor to eat sadly.
He felt that he was now a very experienced person. He could go to Zhihu and answer the question "What is the experience of social death?" anonymously.
Finally, after ten long minutes, Song Yu turned around expressionlessly and put the half-used chalk on the table. "This is what I'm going to say next."
The sound of the self-heating rice started to sound like a deflated balloon. The sound became more and more listless. Le Zhishi's head was now hanging on the table.
"The first part is to find your weakest link. You all know the bucket effect," Song Yu said as he left the podium as expected.
The students in front of the podium hurriedly put away their phones. The students in the front row turned to look at Le Zhishi with the mentality of watching a show.
The person who was rumored to have bullied his younger brother came to teach the class. He caught his younger brother stealing food in class. It would not be right if he did not teach him a lesson.
"Systematically sorting out the wrong questions is an effective method. It's not scary to make mistakes. Everyone makes mistakes. What's scary is that many mistakes will be repeated, and in the end, it will cause you to lose points. So what you should do is to reduce the frequency of the same mistake. "
As he spoke, he had already walked to Le Zhishi's side, his slender hand seemingly unintentionally supporting himself on his desk.
He spoke steadily and logically, from the topic of sorting out the wrong questions to the techniques of scoring multiple-choice questions, such as the graph combination method, the substitution method, and so on. But Le Zhishi was like an ostrich, he couldn't hear anything except the sound of his own heartbeat.
Song Yu seemed to be tormenting him on purpose. He just stood beside him and talked, not going anywhere.
"… This is part of the multiple-choice question. Now, use the questions at hand to practice the multiple-choice questions I just talked about. You have ten minutes. " After he finished speaking, Song Yu finally lowered his head and looked at Le Zhishi, who had been pretending to be dead. He bent his knuckles and gently knocked on the desk.
Le Zhishi raised his head pitifully with an expression that said, "I know I was wrong." He obediently took out the self-heating rice box that he had hidden in the drawer.
Song Yu raised his eyebrows and said in a low voice, "Does it smell good?"
When they heard this, the surrounding students couldn't help but laugh.
"It's okay." Le Zhishi answered very honestly. He then added in a low voice, "It smells good."
Jiang Yufan was a loyal person. When he saw that Song Yu was in a difficult position, he immediately helped him explain, "Senior, I bought this. I bought it wrong. It's my fault. I can write a self-reflection. "
When he saw that Jiang Yufan wanted to take responsibility, Le Zhishi immediately said, "No, I wanted to eat it."
Zhang Chen didn't mind the drama. "Senior, I can prove that Le Zhishi ate it. They had been secretly discussing for a long time. They wanted to eat self-heating rice during the evening self-study session. "
Jiang Yufan was angry. "Do you have the right to say that? It's like you haven't eaten takeout during the evening self-study session. Besides, he didn't plan to eat it in the classroom. "
The two of them argued. Song Yu's eyes swept across the laughing students. Everyone seemed to be looking forward to his punishment. Finally, he spoke expressionlessly.
"I'll take this opportunity to explain the principle of self-heating rice to everyone."
Zhang Chen's face was full of disbelief. This was completely different from the way he had imagined he would be punished.
Song Yu didn't care about the whispers of the surrounding students. He picked up the lunch box on the desk. "Look here."
"There's a heating pack at the bottom of the self-heating rice box. It contains quicklime, sodium carbonate, an aluminum-magnesium mixture, and other chemicals. Quicklime, which is calcium oxide, reacts with water to form calcium hydroxide. At the same time, it releases a large amount of heat. Sodium carbonate often plays an auxiliary role. Aluminum-Magnesium powder can also release heat through the oxidation reaction. So when we inject water, the heating pack will work and automatically heat the food. "
He lowered his head and met Le Zhishi's surprised eyes. He continued, "However, this kind of self-heating fast food has the possibility of explosion. The freshness of the food is also not enough. I don't recommend that you eat it often."
After that, Song Yu put down the lunch box and pointed to the blackboard. "I've written down the relevant reaction equations on the bottom right corner of the blackboard. Students who are interested can take a look."
Le Zhishi looked at the equations on the blackboard. It turned out that he already knew what was going on at that time and calmly wrote it down.
At first, everyone just thought it was funny and wanted to watch the show. They didn't expect a social death to happen in chemistry class. They were a little confused. The amazing thing was that they had learned some of the reactions, but they had never connected them to real life. It was a magical feeling.
"Combined with the example just now," Song Yu leaned on Le Zhishi's table and said, "everyone should never forget that calcium oxide reacts exothermically with water."
Everyone laughed in unison. However, Zhang Chen was obviously unwilling to give up. He raised his hand with a sly expression on his face. "Senior, why is there a sound? It's too funny. "
He obviously wanted everyone's attention back to the sizzling sound of the self-heating rice.
Song Yu leaned on the table and didn't answer directly. Instead, he looked at the other students. "You should have done chemistry experiments, right? Can anyone tell me which chemistry experiments you have done that produced a special sound? "
A girl whispered, "Sodium and water …"
Song Yu nodded to her affirmatively. "This is a classic example. Many chemical reactions produce sounds." He deliberately glanced at Zhang Chen, who deliberately asked the question just now. "There's nothing to be surprised about."
Zhang Chen's face quickly fell. He could clearly feel a hint of sarcasm in the other party's cold tone.
"In addition to the reaction itself, the exothermic process also produces a large amount of water vapor, and the collision will also produce a sound. This process involves a lot of reactions similar to a primary cell, which you haven't learned so far. "
Song Yu lowered his head and glanced at him. "I believe … if Le Zhishi classmate knew the principle behind this from the beginning, he wouldn't have chosen to heat the self-heating rice in a quiet environment."
Le Zhishi classmate.
This name sounded strange to Le Zhishi, but for some reason, it evoked a trace of joy.
Although Song Yu's expression was still cold, it did not have the intention of censuring him. Obviously, every sentence was to popularize chemistry knowledge, but anyone could hear the hidden meaning of exculpation.
Le Zhishi thought that now, at the bottom of his anonymous answer, he could update it with a real-time "I'm alive again!". No, he could even cancel his anonymity.
While he was in a daze, a broad palm fell on his head and rubbed his fluffy soft hair. It was very brief and very light. He didn't react in time. He only felt the hand leave his head, but it left behind a sentence.
"If you don't eat it, it'll be cold."
This head rub came so suddenly that the surrounding students were a little surprised.
The rumor that the relationship between the brothers was very bad was dispelled by Song Yu's extremely rare intimate contact.
Le Zhishi didn't even raise his head. "I'm going out to eat."
After he finished speaking, he took the lunchbox and walked out a little unhurriedly.
The bathroom was on the right side of the stairs, next to the restroom. Le Zhishi saw that there was no one around and slipped in. The instant food tasted very ordinary. The rice was very hard, and the vegetables were a little too salty.
He was in a daze as he chewed. After swallowing, he raised his hand and touched his head. He lowered his head and took another big bite.
He was so hungry that he didn't feel hungry. After what had just happened, Le Zhishi didn't have much of an appetite. He was thinking about Jiang Yufan saying that he wanted to try the food, so he didn't leave after eating. However, the little Jiang Yufan had experienced too much and couldn't remember anything. He waited for five minutes, but he still didn't come.
Song Yu was still in class. Le Zhishi didn't want to waste too much time, so he cleaned up and went back to the classroom. When he reached the door, Song Yu was standing on the podium and talking about the revision plan for English. He stood at the door and called out softly, but didn't directly enter.
Song Yu heard him and nodded at him, then continued to talk as if nothing had happened.
Le Zhishi quietly returned to his seat and listened to the lecture with the other students. During the entire class, Song Yu, who didn't bring any materials with him, only spent ten minutes to sort out the context of the mind map. Then, he led everyone through it with a clear train of thought. The ease with which he handled it even exceeded that of many teachers.
"Time is limited, so that's all for now." Song Yu stood sideways and looked down at his watch. The first night self-study period was about to end.
"Le Zhishi."
Hearing his name being called, Le Zhishi was stunned and quickly looked up at his brother.
Song Yu's chin nodded in the direction of the blackboard. "Wipe the blackboard."
Le Zhishi immediately nodded obediently. "Okay." Then he was about to stand up.
Growing up, Le Zhishi's biggest fear was Song Yu ignoring him, especially after he did something wrong. However, if Song Yu scolded him or gave him some form of punishment, it meant that he wasn't angry.
When Song Yu was really angry, he wouldn't speak.
They knew each other well enough.
"Don't wipe it." The girl taking notes looked up. She hadn't been paying attention during the lecture and was now rushing to copy the blackboard. "I'm not done yet." The others chimed in. Le Zhishi was in a bit of a dilemma.
Song Yu glanced at them indifferently. "Since your phones can be used to chat, you should be able to take pictures too."
Everyone choked on this sentence, especially those who were gossiping and laughing in the group just a moment ago.
The bell rang and Song Yu left the classroom. Le Zhishi did as he was told and wiped the blackboard. Jiang Yufan was a loyal friend and took another blackboard eraser to accompany him. "Was the meal good?"
"It was okay." Le Zhishi looked at him. "I waited for you for five minutes, but you didn't come."
"So you were waiting for me. I was wondering why it took so long. I forgot about it. " Jiang Yufan rolled up his sleeves. "Zhang Chen, that idiot, even said that you were too embarrassed to come back. I'm so angry. You can't win her heart and you're venting your anger on others."
Le Zhishi waved his arms and wiped the blackboard vigorously. He didn't really care about what others said when he wasn't there. "He's just addicted to talking for a day or two. If the person I like likes someone else, I definitely won't be happy. "The hand holding the eraser suddenly paused. Le Zhishi's eyes stopped on the lines of equations in the corner.
This was the last unfinished task that Song Yu had given him to clear.
"Do you have your phone with you?" He turned to look at Jiang Yufan who was dusting.
"Yes, why?" Jiang Yufan took out his phone and handed it to him. "You only remembered to take pictures now? It's all gone."
Le Zhishi didn't say anything. He used his phone to take a picture of the equations in the lower right corner.
"Thank you. Send this to me."
Le Zhishi had mixed feelings. Was he mocking him? Was he mocking him?
But Song Yu was right. He was indeed a troublemaker.
Thinking of this, Le Zhishi's expression became a little depressed. When Song Yu reached out a cotton bud, he shrank back and apologized in a low voice. "I'm sorry."
Song Yu didn't respond to his apology. Instead, he reached out his other hand and held his chin. "Don't move."
As soon as he said that, Le Zhishi really didn't move. However, his mind began to wander. He remembered that in school, whether it was when he won a speech competition or when he was knocked down while playing basketball, Song Yu never took the initiative to approach him. They were very serious about playing the role of strangers.
So now, Le Zhishi was even a little grateful that his sudden asthma on the first day of school forced them to reveal their complicated relationship. Walking together seemed very open and aboveboard.
Seeing that he was in a daze, Song Yu said casually, "Is it good?"
Le Zhishi pulled himself out of his thoughts. After hearing this, he was very sure that Song Yu was mocking him.
"I accidentally inhaled it." He frowned.
This scene reminded Song Yu of when they went to the dentist together when they were young. Le Zhishi ate candy until his mouth was full of teeth. Lin Rong took them to the dentist's office. As soon as he heard the sound of the electric drill, Le Zhishi opened his mouth and cried. He grabbed his hand and wouldn't let go.
Song Yu continued to wipe and said calmly, "What's the smell?"
"Cantaloupe." Le Zhishi described it truthfully. "At first, it was sweet, but then it became a little disgusting. It was like fever syrup."
He could describe it in such detail.
After that, Le Zhishi spat out a little and wrapped it in paper. "Could it be that the person who made the refill guessed that someone would inhale it, so he deliberately made it sweet?"
Song Yu glanced at him. "If you knew that the refill was sweet earlier, you wouldn't have to go to the dentist. You wouldn't have tooth decay if you ate it like candy.
He was being teased again, but Le Zhishi completely misunderstood the main point. "Did I go to the dentist when I was young?"
It was unbelievable. How could he forget when he was crying like that? Shouldn't he remember it for the rest of his life?
"Your childhood memories are really vague," Song Yu said.
Le Zhishi didn't comment. He held his wrist and said in a muffled voice with saliva, "So what? Don't you remember everything?"
"Anyway, my childhood was yours."
Song Yu was slightly stunned.
Le Zhishi didn't feel that he had said anything important. His legs were still moving, and he couldn't stay still. Song Yu returned to silence. He pressed his hand on his swaying knee and carefully wiped the ink between his teeth with a wet cotton swab.
With his knee pressed, Le Zhishi looked down and saw that his wrist was empty. There was no watch on it.
"Aren't you wearing a watch?"
Song Yu didn't answer immediately. Le Zhishi said again, "Why not?"
This self-righteous manner of asking questions reminded Song Yu of the first time Le Zhishi gave him this watch. When he was rejected, Le Zhishi also asked him with such a direct expression.
"Why not?"
"Brother Yu, don't you like it?"
Le Zhishi was even more naive when he was young. He held the gift box of the watch and looked at it with satisfaction. He looked up and asked, "Doesn't it look good? I asked the lady at the counter to pick it out with me. She promised that you would like it. "
Song Yu didn't dislike it, but he knew that this reward was very generous for a primary school student. He could use it to buy a lot of things. There was no need to spend it on a watch that was given to someone else. At the same time, he also knew that it was useless to tell Le Zhishi this. He was a stupid and stubborn child.
Therefore, he decided to communicate with the receptionist directly.
"Hello, I want to return this watch. I haven't used it before. The packaging and receipt are all here. According to the mall's regulations, I should be able to return it."
A cute mixed-race child buying a watch alone had already left a deep impression on the receptionist. Now, his older brother was handling the return with a mature attitude that surpassed his peers. It was hard not to feel strange.
"Yes." The receptionist maintained her smile, "Please show me …"
Le Zhishi, who was in front of the counter, shouted "No". He then sat on the ground and hugged Song Yu's leg tightly. He cried and begged him. At first, Song Yu was still impartial. He took out the receipt and handed it to the receptionist. But Le Zhishi was crying so hard that even the receptionist couldn't help but persuade him, "Why don't you talk to your brother first?"
Song Yu thought for a while. In the end, he squatted down and took out a pack of tissues from his bag and gave it to him, "Why are you crying?"
"You, you don't want my gift." Le Zhishi sobbed. The more he spoke, the more wronged he felt, "I didn't even finish saying happy birthday, you, you …"
Seeing that he was about to cry again, Song Yu immediately said, "It's not that I don't want your gift."
Le Zhishi choked. He listened to him with tears in his big eyes.
"It's that this gift is too expensive. This kind of spending is irrational."
Maybe one day, when he looked back, he would regret the first big expense of his life.
The tear that he had been holding back still fell. Le Zhishi wiped it with the back of his hand, "But I looked at it for a long time. It's not that I don't know anything. You all think that I don't know anything. "
Hearing this, the receptionist standing at the side couldn't help but say, "That's true. When the little brother came on the first day, I also thought that he was playing around. But he came three times in a row. He picked for a long time and only paid on the last day."
When he took the money out of his bag, he carefully counted it three times.
The receptionist looked at Song Yu, "He's quite cautious."
Song Yu was silent. He still couldn't bear to see Le Zhishi cry and do what he thought was right, so he didn't return the gift. Le Zhishi tacitly agreed that he was willing to accept the gift and went home with him, satisfied.
At night in his room, Song Yu sat in front of his desk. The table under the table lamp emitted a bright light. He held the price tag and looked at it for a long time. He planned to return the gift alone the next day.
Before going to bed, he wanted to get a glass of water. Halfway down the stairs, Song Yu saw Le Zhishi in his mother's arms, watching a cartoon with a lollipop in his mouth. He pointed at the Little Genius Watch commercial on TV, "That watch isn't as nice as the one I gave my brother, right, Aunt Rong?"
"Of course. The one you bought is the prettiest. Even ten of these can't compare." Lin Rong patted his head and asked, "Le, why did you want to buy a watch for your brother?"
Song Yu stopped in his tracks.
Le Zhishi took out the lollipop in his mouth and said in a serious tone, like a little adult, "We used to be together every day. I could go down two floors to play with my brother. Now that he's in junior high school and has gone to another school, I miss him a lot, so I let my watch accompany him. " He raised his empty wrist and said with a smile, "Brother Yu will think of me when he looks at the time."
"Our Le is so smart."
He didn't expect that behind the crying, there was such a thought behind it. Song Yu went back silently, sat down, and put the watch on himself.
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