值日生给教室打扫卫生时都会灰尘四起,每天都这样,同学们备受灰尘的侵袭。即使洒水也不行,不是扫不掉灰尘就是和稀泥。我想发明一种“电动吸尘脚垫”放在教室门口,当然也适合家庭使用。谁进屋之前都要在吸尘脚垫上站一 The value of Health to the classroom when cleaning the dust will be everywhere, every day, students are much affected by the invasion of dust. Even if the watering is not enough, it is not sweeping dust and mud. I would like to invent a “electric vacuum pad ” on the classroom door, of course, suitable for home use. Who should stand in the vacuum mat before entering the house