Peb-sab ntim hnab ntim khoom yog ib hom kev ntim khoom yooj yim siv rau ntau yam khoom, suav nrog zaub mov, khoom noj txom ncauj, tshuaj, thiab lwm yam.Cov hnab no yog tsim los ntawm kev sib khi peb sab ntawm ib daim ntawv tiaj tus ntawm cov khoom ntim, tawm hauv ib sab qhib rau sau cov khoom.Lub sab qhib yog ces kaw tom qab sau, tsim kom muaj kev ruaj ntseg thiab airtight pob.