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"In the past, class meant a blackboard and chalk. Not to mention the chalk dust everywhere, I came home exhausted after a whole day of teaching," recalled retired teacher Miao, who lives in the Hexi area of Changsha. With the popularity of computers and the application of projectors and other teaching equipment, PPT has also played an important role in teachers' classroom presentations. At the exhibition site yesterday, the electronic whiteboards in interactive classrooms were even more amazing - a simple touch of the hand produces marks on the whiteboard, allowing writing, drawing, and even linking to any file on the computer. The teaching equipment exhibition truly opened people's eyes.