Tinplate cov ntaub ntawv luam tawm hlau tuaj yeem: qib zaub mov feem ntau yog siv rau cov khoom siv semi-kua, kua dej, khoom noj, cov khoom ntim khoom ntim, cov khoom siv no thaiv, roj tsis kam, noo noo-pov thawj, shading, aroma preservation yog zoo heev, belongs rau cov khoom noj ntim kev lag luam indispensable.
