I have a good idea in order to solve these problems is to let students wear the cloth off the mouth to prevent dust as well. Introduction to water, carpet throughout, so that less dusting.
I have a good idea is to solve these problems. Students should wear a mask To prevent fine dust Recommend sprinkling water over the road to keep dust down.
I have a good idea in solving these problems is the student wearing a mask to prevent dust. Introduce the carpet water over the road to achieve dust less.