Airpollution,suchassmog,hasbecomeaseriousproblemaroundt...
问题详情：Airpollution,suchassmog,hasbecomeaseriousproblemaroundtheworld.Besideswearingamask,whatelsecanwedotoprotectourselvesfromthedirtyair? Scientistshavedevelopedanewinhaler(吸入剂)thatcanreduc...