老师讲课时经常要擦黑板,粉笔灰飘落到老师的身上,弄脏老师的衣服,还有一些粉笔灰被老师吸入,更是有害健康。我想发明一种“黑板刷遥控”。这种黑板刷像汽车上的雨刮器,是吸附在黑板上的,不用时置于黑板角落上,当老师要擦去黑板上的文字时,可以站在远离黑板的地 The teacher often wipes the blackboard while teaching, the chalk falls to the teacher's body, dirty the teacher's clothes, and some chalk dust is inhaled by the teacher, which is even more harmful to health. I want to invent a “blackboard brush remote control.” This blackboard brush like a car wiper, is adsorbed on the blackboard, when not in blackboard corner, when teachers want to wipe the text on the blackboard, you can stand far from the blackboard