老师每天都要在黑板上写字,每节下课都要擦字,擦黑板时,灰尘很多,很不卫生,也很吃力。我就想发明一种自动清理的黑板,在这种黑板上写字跟普通的黑板差不多,但如果你要擦掉不需要的字,只要用配套的粉擦轻轻一点,字就会自动清除。 Teachers write on the blackboard every day, every class must rub the word, when the blackboard, the dust is a lot of very unhygienic, but also very difficult. I wanted to invent a self-cleaning blackboard on which to write something similar to a normal blackboard, but if you want to wipe out unwanted words, just wipe it gently with a matching powder and the word will be automatically erased.