An unforgettable lesson

Since I entered primary school, I have taken many classes, including lively Chinese class, interesting math class and endless mysterious nature class. A science class in grade three is still fresh in my memory.

It was a Tuesday morning three years ago, near the school, and Mr. Hong gave us a special assignment, that is, everyone went home to prepare two egg shells. We were all stunned when we heard the teacher assign this homework. Some people speculate that maybe the teacher will let us make it by hand. Some speculate that the teacher may want us to draw eggs; I guess Mr. Hong must let us do the experiment.

Looking at our puzzled look, Mr. Hong gave a "mysterious" smile, as if to say, "The answer will be revealed in the next class."

At the beginning of the class, everyone was anxious for Mr. Hong to solve the mystery quickly. Miss Hong guessed our thoughts and said slowly, "Students, please put the prepared eggshells on the table. We are going to do an experiment with this eggshell. " I was very proud when I heard that I was going to do an experiment. I guessed Mr. Hong's intention.

"Students, look at this eggshell. Is the arched side easy to break or the sunken side? "

The students said in unison, "The concave side is easy to break."

"Why?" No one knows why.

Teacher Hong went on to say, "Please take out the prepared eggshells and let's do an experiment together."

I put the eggshell on the ground, arched my face, raised my pen about 5 cm high on the eggshell, and gently put it down, and the pen touched the eggshell. Alas! The eggshell is safe and sound. I thought: maybe I didn't work hard! Or try again. This time, I just aim the pen tip directly at the arched surface of the eggshell and pound it hard. Strangely, the eggshell is still intact. I looked around and my classmates looked puzzled like me.

Seeing that we were at a loss, Mr. Hong smiled and said, "Students try again with the concave surface of the eggshell and compare their differences."

We turn the eggshell upside down, so that the concave surface of the eggshell faces upwards, and break the eggshell with a pen. It turns out that the concave surface of the eggshell is so fragile.

"Teacher, why is this?" Some students lost their temper and began to ask questions to the teacher.

Teacher Hong conveniently picked up an eggshell on a classmate's desk in the front row and said, "This is the principle of thin shell structure. Because the arch surface of this structure can offset the external force, the structure is stronger. The Great Hall of the People in Beijing and the Sydney Opera House make full use of this principle. Of course, the thin shell principle is everywhere in our daily life. Please ask the students to discover and explore. "

In the past few years, I gradually found that helmets and car windshields ... all come from the thin shell principle, and this class of teacher Hong left me with a lot of thoughts.

868 words

Example 2:

An unforgettable lesson

The stars are twinkling, and I stopped under the starry night sky, reminding me of the scene of that class.

I remember in a Chinese class, we were learning to read and recite. When we understood the composition of two-part allegorical sayings, the teacher said to us, "whoever I draw now and who can't recite it will be deducted in the group." "ok!" We answered the teacher with one voice. I suddenly felt uneasy in my heart, thinking: If the teacher draws Tan Xiaotong, he will lose points if he can't recite it. What should I do? All the students drawn by the teacher passed the exam one by one. Tragedy arrival, the teacher shouted: "Tan Xiaotong, you came back with sesame blossoms, and then what?" Xiao Tong stood up, and my heart followed. She lowered her head and said nothing. I looked at other students, only to see some people whispering to my deskmate, some grinning, looking ironic, some looking around, trying to boo me ... As for my classmates, some were anxious, and some blushed when they said they were serving you. More interestingly, some students learned from western countries and drew a cross to pray for a miracle. I also sweat about serving you. Knowing that she can't recite. Unexpectedly, the miracle really happened Tan Xiaotong got up the courage, raised his head slightly and said hesitantly, "The festival ... is high." "Ok, please sit down!" The teacher was very happy, and then said, "Nothing is difficult in the world. If you put your mind to it, you can recite it, which shows that she has worked hard and paid. We can't look down on others." It is disrespectful and unfair to look at everyone with colored glasses. I hope students can get rid of their bad habits. "I looked down, regretting that I had hurt a fragile heart unintentionally, and decided to take off my colored glasses when I looked at people in the future.

That Chinese class made my classmate with good grades deeply regret and blame himself, and also deeply realized that everyone will have shortcomings and advantages, but they will never be perfect.

The teacher's earnest words have been echoing in my ears, constantly inspiring me to move forward. In the future study, life and work, no matter whether your own conditions are better than others, you must take off your colored glasses and treat everyone fairly in order to get respect and welcome from others.

I have participated in many classes since I was a child, including Chinese class, math class, music class and art class ... but what I remember most is the unique Chinese class.

It was a Chinese class in grade three. Our Chinese teacher came, and the teacher said, "If you want to write a good composition, you should pay attention to observation and write more." The teacher asked us to put forward some interesting science games and tell the reasons.

No one dared to raise their hands at first. Later, some students suggested that you grind the pen on your hair for a while and iron it so that you can suck small notes. At first, many students didn't believe it, so the teacher asked us to do it ourselves. I want to do it, too. I wiped my head with a pen first, because I am an impatient person. After a while, I felt a little hot and started smoking, but I couldn't. I asked the teacher, and the teacher said, "You didn't grind it hot enough." Don't want to grind, waiting to share other people's "research results." Later, some students succeeded. The teacher asked us to say why this happened. I quickly raised my hand for fear that other students would raise their hands first and speak first. I said, "It's because the pen rubs static electricity on my head, and then I can suck paper." We started talking about it. Seeing that we were in a good mood, the teacher said, "Students, can you write a composition through this?" The students began to write at once. In a short time, the students handed their compositions to the teacher.

To do a good job, a person must not only have a good foundation and improvement, but also have a good training method to become a successful person!

As a seventh-grade student, I don't know how many classes I have attended. However, this class-a class that people can't notice in advance, I will never forget that it is a Chinese class. As soon as the bell rang, the teacher strode into the classroom, stood on the podium seriously and said to us, "Please write down the three people who are most important to you." I thought about it and wrote down "relatives", "friends" and "teachers". I think these three are very important in life. No one is afraid that life will be incomplete.

"Next, please cross out one of these three categories." I froze, pursed my lips and crossed out "friends". After all, a family is incomplete without relatives; Without teachers, progress is difficult. I also know that if I cross it, I can't go back. What is lost will be happiness, and what is ushered in will be loneliness!

I know the teacher will definitely let us cross out the second one. Sure enough, the teacher said seriously, "Please cross out another one." Reluctantly, I picked up the pen and crossed out "teacher" gently. I think family is the most important thing. My mother brought me into this world, and then my family made me feel my family. Finally, the teacher asked us to cross everyone out. Although it is a game, I feel so scared of death when I cross it off! How afraid I am of losing the person I love, how desperate I will be. ...

When the bell rang, the teacher announced the class was over. My mind is blank, only the word "love" echoes in my mind. ...

An unforgettable lesson

With the teacher gone, we don't seem to have to learn an unforgettable lesson, but we have branded this unforgettable lesson deeply in our hearts. That unforgettable lesson was completed by the teacher at the cost of his own life. I can only say "teacher, I love you!" " "

The bell ... bell ... bell rang, and we happily returned to the classroom, waiting for the teacher to arrive.

Looking forward to, looking forward to, finally saw the burly figure of the teacher. The teacher came to the classroom with a stack of books and wrote an "unforgettable lesson" on the blackboard. As soon as the chalk fell, I only felt the classroom shake and the Chinese book on the desktop fell to the ground. I vaguely heard the teacher say to us nervously, "Run! Run! " I don't know what happened, but I know it's right to listen to the teacher. When I "squeezed" from the teaching building to the playground, I "shook!" The sound came from behind me, like a large group of people running towards me, shaking the earth ... I turned my head and saw only the collapse of the teaching building and yellow smoke!

In the confusion, I found my deskmate She gasped and said to me, "Earthquake! Earthquake! " I was shocked and really didn't know what to do. I don't know how long it took before I woke up and shouted, "Teacher! Teacher! " So, I took my deskmate's hand and ran to the pile of teaching buildings that had already become ruins. Where is the teacher and where are our classmates? We don't know, we only know "planing"! Four minutes, forty minutes, four hours, we have been looking there, looking, looking! I hope I can find a fresh and lovely face in the ruins with only slate, cement and steel bars left. "Teacher, teacher!" I shouted excitedly: "teacher, I'll call my classmates to save you!" " The poor teacher was pinned under the blackboard that said "an unforgettable lesson". It was dark, and the adults got together and surrounded the teacher who was pressed under the blackboard. They seem to be saving the teacher.

"Pat ... Pat ..." With applause, the teacher was finally carried out. Unfortunately, we can't hear the teacher's sweet voice anymore. Then, four students were rescued without any harm. Later we learned that the four students were closely protected by the teacher's burly body.

With the teacher gone, we don't seem to have to learn an unforgettable lesson, but we have branded this unforgettable lesson deeply in our hearts. That unforgettable lesson was completed by the teacher at the cost of his own life. I can only say "teacher, I love you!" " "

2. An unforgettable lesson

A wisp of cool Xia Feng blew into the classroom.

A teacher is giving a lecture, full of passion, very happy and his forehead is shining.

The students are sleepy, with the unique laziness in the afternoon, and sleepy in the sunshine of knowledge.

Suddenly, a discordant note jumped out and destroyed this seemingly calm ensemble! I only heard the teacher shout, "Who tied my ass with rubber?"! I was shocked, too, and looked up. Everyone was shocked. The teacher's "lion roar" shook the earth and the air solidified instantly. A second later, the brain came to its senses, reflected it and burst into laughter. Laughter, like a rapidly swinging ripple, spreads relentlessly and violently impacts the teacher's eardrum. The teacher's face is redder, rising like a purple eggplant; Small eyes suddenly jumped out of the meat, as if to explode and catch fire; My lips kept shaking, as if to say something, but I couldn't say a word. Finally, in the crazy laughter of my classmates, I threw down a book and slammed the door angrily!

Looking at the still banging door panel, the students stopped laughing gradually, looked at each other one by one, and began to feel the seriousness of the matter: another teacher was angry! Alas, I'm sorry to say that our class is a "trick-or-treating class" famous for raising schools. All the students are smart and naughty, but they just like being naughty! Often make the teacher cry. This makes our best-tempered geography teacher angry again-maybe because geography is too difficult to understand, maybe because the teacher is a foreigner, maybe because his accent is different from ours ... anyway, we don't like learning geography!

Can stay for a while, everyone began to whisper:

"Teachers are usually very kind to us."

"Yes, his geography class is not easy to understand, but he is so serious every time!"

"Yes, yes, last time I was not very good at doing problems. He told me three times ..."

"Besides, his accent is different from ours, but his lectures are the most humorous!"

All kinds of words, you give me a sentence, I find the teacher so cute. So everyone began to blame the "culprit". This guy seems to know that he is wrong and dare not say a word, let alone admit it.

Finally, the monitor stood up: "Take the initiative to admit your mistake and invite the teacher back."

"yes! Right! " Everyone responded unanimously. Six group leaders followed the monitor into the office. A pair of expectant eyes stared at the door quietly and nervously.

Wait, wait, wait ...

Finally heard footsteps, everyone immediately sat up straighter, eagerly looking at the teacher and whispering their feelings.

The teacher's face softened a lot, coughing slightly, and his voice was hoarse:

"The saddest thing is that other people's work is neglected and trampled," the teacher paused gently, and then said, "I am working, aren't I? In fact, you are also paying for your study. If you don't cherish it, you will eventually regret it. Maybe I'm a foreigner, maybe I can't adapt to the local customs here, and everyone seems to be unconvinced by me. But I really want to teach you well. I always believe that you will eventually accept my labor and get some insight into my contribution. I don't ask you to remember me. I just hope that students can really learn some knowledge, at least in the future, they can go to society and support themselves! "

The students all hung their heads in shame.

The teacher seems to have choked up: "Students, please be a teacher, study hard and be a serious person!" " Your parents are sadder than the teacher! ……"

The whole class was deeply moved. Eyes are red.

The bell rang, and 36 students in the class bowed deeply to the teacher! So serious! So sincere! ……

Since then, the word "teacher" has become stronger and stronger in our hearts. I think the teacher planted the word "sensible" in our hearts with tears. ...

Another ray of cool Xia Feng blew into the classroom.

A teacher is giving a lecture, full of passion, very happy and his forehead is shining.

The students blinked their bright eyes and gave a burst of cheerful laughter from time to time, just like a free fish swimming happily in the ocean of knowledge. ...