Rauav luaj puacov khoom lag luam, peb yuav npaj tus kws tshaj lij los soj ntsuam cov khoom thaum cov khoom tiav. Peb yuav kuaj qhov ntev, lub taub, tuab, zinc tuab, qhov hnyav, thiab ntim khoom ntawm cov pawg. Peb tseem yuav ntsuas cov ntsiab lus ntawm cov khoom, xws li lub qhov loj me, los muab cov qhua tuaj noj mov kom paub cov khoom zoo thiab zoo.
