Time flies, and by 2021, in the process of building a moderately prosperous society in an all-round way, our education has also undergone changes again and again, cultivating generations of outstanding talents. As the carrier of teachers to disseminate knowledge, the blackboard is not proud, but it has nurtured generations of students, is the most beloved fertile soil of teachers, and witnesses the reform of educational concepts.
I remember that there was a deserted school near my grandmother's house. There are still mottled handwriting on the blackboard of the classroom, as if it tells the sound of books that used to be here, and because of the long time, the blackboard has cracked, which is the earliest blackboard in my memory. It is made of several pieces of wood spliced together, the surface is brushed with paint, because it is wood, it takes a lot of chalk, and the blackboard is wiped, which will produce a lot of dust, listen to Grandpa, the teachers' hair, face, clothes are white after class, which has also become the memory of a generation.
When I was in elementary school, the blackboard in the classroom was replaced with a cement blackboard. This blackboard is made of a mixture of fine sand and cement, brushed on the white wall, and then brushed with a layer of black paint, compared to the kind of wooden blackboard I remember, it has a smooth surface and is not easy to damage, but there will be a reflective situation, and students sitting on both sides will often not see the blackboard string seats. The impression was that there were slides in the multimedia classroom at that time, but transparent plastic slides were needed, and there were not many materials, and every time I went to the multimedia classroom, I felt very angry, which showed how much students longed for multimedia teaching tools.
After entering the junior high school life and entering the classroom, the most impressive thing is the blackboard like glass, which the teachers call the frosted glass blackboard and hangs on the wall, which is more magnificent. The advantage of this kind of blackboard is that it will not reflect the light, and students sitting on both sides of the back row can see the blackboard without stringing seats, and the degree of smoothness is higher, and the chalk writing is very delicate. But it is still easy to produce fine dust, and the students in the front row will not only become bald-headed, but also cough constantly because the dust flies into their throats.
In the third year of junior high school, the school was overhauled during the summer vacation, and the frosted glass blackboard in the classroom was gone, replaced by a blackboard, and the color of the blackboard changed from traditional black to dark green. Dark green is said to be conducive to protecting vision, and the brushing sound when writing is very good, very smooth, not easy to damage, and the clarity is higher. At this time, computers have begun to be installed in the classroom, and there is no need to go to the multimedia classroom.
After junior high school, the blackboard of the school I attended became a whiteboard, and the chalk became colored pens, blue and red watercolor pens. The blackboard wipe requires a detergent to be placed to wipe it clean, so the whiteboard solves the problem of chalk dust and is easier to write. But the watercolor pen would flow down, and the words written on the whiteboard would seem to be crying. The whiteboard will also be because of the long time, some handwriting can not be wiped clean, the whiteboard becomes a "blue board".
When I came to the university, it was in the lecture hall, and the blackboard became larger, occupying a large wall, divided into many pieces, and could be moved up and down, left and right. At that time, in the western economics course of the elective, the teacher would demonstrate a lot of calculation processes in class, and this blackboard was full of writing, and when it was pushed up, the other blackboard came down. After a class, four blackboards are full of writing, and the multimedia at this time is already a must for class, and teachers will use PPT to teach us lessons.
Later, after I went to graduate school, I began to follow the tutor to the school for a visit, and was surprised to find that the whiteboard of some schools became an electronic whiteboard, which can not only put PPT, but also touch handwriting, with different fonts and colors. Some mathematical figures no longer need to be drawn on the blackboard with heavy teaching aids, and only need to move their fingers to draw standard squares, rectangles, and triangles.
Later, I interned at a new school, where the classrooms were equipped with a more "tall" LCD touch all-in-one, like a large smartphone, which could be used to write books directly on the LCD screen with your fingers. Each page of the board book on the LCD touch screen can be saved, and when reviewing, you can turn the page forward to find the board book that you wrote down before. Students have not had time to record the content of the board book such as the problem solving steps in class, and they can look through the records and then copy them after class. And the computer in each classroom is networked, you can directly search for some video materials on the Internet, which is very convenient, and more amazing is that you can also connect to the mobile phone. The small blackboard connects the big world, and truly realizes that the show does not go out and can know the world.
A drop of water can refract the sun's rays, a blackboard can reflect the development of education, from the initial wooden blackboard to the cement blackboard, from the cement blackboard to the frosted glass blackboard, from the frosted glass to the iron glass, from the tin glass to the handwritten whiteboard, the electronic whiteboard, and then to the current LCD screen, recording the trajectory of the development of the times, witnessing the great changes brought about by the 40 years of reform and opening up, and its every change is surging with the passion of reform and innovation; its every change is moving towards a higher, stronger and greater Chinese dream!
Author: Tian Lin Sanzhong Guo Qianqian
Editor: Ye Fangfang