With the passage of time, some things tend to change from clear to fuzzy, and from fuzzy to gradually forgotten. However, a common sense lesson I took in primary school is still deeply imprinted in my mind. There was silence in the classroom after the bell rang. A middle-aged teacher with glasses walked into the classroom and stepped onto the platform, holding teaching materials in one hand and teaching AIDS in the other. He is our common sense teacher. The teacher gave a glass of water. I looked at it curiously and guessed. "Students, do you know what this is?" The teacher's loud voice rang in my ear. "water." The students answered in unison. "yes. Can you tell me what water is like? " "Water is what we drink and use every day." "Water usually exists in rivers, lakes and oceans." "Water flows." ..... Suddenly, the students talked about it one by one, like a pot of boiling water. During the discussion, the teacher took out another piece of iron and let us compare it with the water in the cup. After listening to the teacher's words, some students leaned on their cheeks and meditated, while others whispered again. I was looking around when the teacher called me. I faltered and couldn't answer, but I felt my face burning. My deskmate raised her hand and answered, "Iron and water have a certain volume, but water is flowing, unlike iron, which has a fixed shape." "Good answer." The teacher said approvingly, and then the teacher took out three bottles of things and put them on the platform. "Now I ask a classmate to come up and tell what's in the bottle. Who will come? " As soon as the teacher's words stopped, I quickly went to the podium with the feeling of "making amends". I first looked at it carefully, then sniffed every bottle mouth and licked it boldly. I said confidently, "colored acid is vinegar, colorless burning is shochu, and colorless and tasteless is water." After listening to my answer, the teacher nodded with a smile and said to everyone, "Remember: water is a colorless, odorless and tasteless liquid." I won't say, but I'm happy. Then, the teacher said in a mysterious tone, "Do you know the temper of water?" Students, you look at me, I look at you, and finally focus on the teacher's face. "This water, it is like change, like the Monkey King. When it meets heat, it will turn into steam, clouds, fly and travel in space; When it meets cold air, it becomes raindrops and moistens the earth. If it is in the cold winter, it will become a beautiful snowflake and cover the earth with a layer of silver. " The teacher looked at the water in the cup and said with a smile: "Water is liquid at room temperature; At zero degrees Celsius, it becomes solid ice; After being heated, it evaporates and rises, quietly turning into steam and running away. This is called the three-state change of water. " At this point, the teacher paused and looked at the students. The students were deeply attracted by the teacher's vivid story and looked at him curiously. The teacher went on to say, "Water is a precious natural wealth of human beings and a good friend of ours. Hydropower can generate electricity, provide us with energy and bring light; Water can irrigate fields and breed a bumper harvest; Water can connect all corners of the country, allowing people of all countries to communicate freely and enhance friendship. In short, ordinary water contains infinite power ... "With the change of the teacher's high and low tone, students sometimes show a knowing smile, sometimes show a surprised expression, sometimes open their eyes with doubts, and sometimes frown and think hard ... Dozens of innocent hearts are deeply attracted by the rich content of cadence words. Just as the students were listening with relish, the bell rang. The teacher walked slowly down the platform with teaching AIDS, and the students looked at him with reluctant eyes ... Friend, if you were there, you would be as impressed as me. Flowers: 3

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