曾爱军和他的伙伴们沉浸在这样的事情当中:他们要让所有的教室和家庭,无论是在黑板还是在白板上,人们书写或者涂鸦,从此不再受粉笔粉尘毒害。要知道,粉笔在人类的书写史上已经有200多年的历史了,粉笔的形态一直都如此,那么曾爱军要改变什么呢?本身就是老师的曾爱军,现在仍要每个星期去辽师大教上几堂课,他从事教育多年,但他用 Zeng Aijun and his partners are immersed in such things as: They want to make all classrooms and families, whether on the blackboard or on the whiteboard, write or graffiti, and no longer be poisoned by chalk dust. We must know that chalk has a history of more than 200 years in the history of human writing. The shape of chalk has always been the same. What did Zeng Aijun change? It is the teacher Zeng Aijun who still needs to go to Liao Normal University every week. He taught for many years, but he used