Thefluisakindofcommondisease.Itspreadseasilyamongpeople.Butweneedn'tbeafraidofit.Whatshouldwedotoprentit?First,weshouldeathealthyfoodanddomoreexercisetobuildupourbobies.Second,weshouldkeepourroomscleanandoftenopenthewindows.Third,weshouldnotgotocrowdedplaces.Finally,ifwedon'tfeelwell,weshouldgotoseeadoctoratonce.Ifwedoso,wewillkeephealthy.