Peb cov vials cia, kuj tseem hu ua kauj ruam vials lossis yeeb yam vials muaj cov tshuaj zoo rau khaws cov kuab tshuaj rau ncua sijhawm. Peb cov ntsia hlau xov cov vials muaj cov xov txaus rau ib nti kom tshem tawm evaporaton nrog lub zog sab saum toj lossis ib ncig cap.
