Tus kws ua haujlwm yuav tsum xyuas kom meej tias cov teebmeem tsis zoo yuav tsum tsis pub dhau qhov kev txwv; Lawv kuj yuav tsum ua raws li cov chaw tsim khoom cov lus qhia ntawm kev siv tshuaj thiab ua cov kev ntsuam xyuas cuam tshuam kom ntseeg tau tias cov txiaj ntsig xav tau tau txais raws li qhov chaw ua haujlwm. Thaum kawg, lawv xav xyuas kom meej tias cov khoom xyaw ntawm cov additives yog qhov tseeb thiab tsis dhau, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm rhiab heev admixtures.
Cov khoom sib xyaw ua ke yog siv rau ntau qhov xwm txheej. Lawv tuaj yeem siv tau thaum cov khoom tsis tuaj yeem tsim los ntawm kev hloov cov khoom siv hauv paus hauv kev sib xyaw, tsim cov txiaj ntsig xav tau kev lag luam thiab tseem ua rau cov pob zeb tsis zoo.
