Thaum tshav kub kub preservation ntawm kub xovxwm

Nws yog hais txog lub sij hawm txuag tshav kub nyob rau hauv lub molding siab thiab molding kub. Nws txoj haujlwm yog ua kom cov khoom sib zog ua tiav thiab tshem tawm kev ntxhov siab sab hauv. Qhov ntev ntawm lub sijhawm txuag hluav taws xob yog nyob ntawm hom molding khoom, qib molding kub thiab cov qauv loj thiab kev ua haujlwm ntawm cov khoom.