Cov number case zoo, tshem tawm cov number case deposit, tsis txhob muaj dej cuam tshuam tshwm sim thaum sau ntawv.
Tsis volatile, ua kom lub nib moist, yooj yim sau ntawv.
Dej resistant, ntev xim, nws tsis muaj tsw ntxhiab tsw.
Nws yog ib qho kev xaiv zoo rau tsev kawm ntawv lossis chaw ua haujlwm siv.