Qhov laj thawj yog vim li cas ob txheej zaj duab xis tshuab tshuab ib txwm ua rau cov yeeb yaj kiab tawg

Muaj ntau qhov laj thawj vim li cas ob txheej zaj duab xis tshuab tshuab ib txwm ua rau cov yeeb yaj kiab tawg

Lub tshuab tshuab tshuab ib txwm ua rau cov yeeb yaj kiab tawg, feem ntau muaj peb qhov xwm txheej hauv qab no

Ua ntej, cov khoom yog qias neeg heev thiab lim tsis huv. Txoj kev daws teeb meem yog muab ob txheej ntxiv ntawm cov ntxaij lim dej.

Qhov thib ob, thaum cov yeeb yaj kiab thickness tsis sib xws, nws tseem yuav ua rau cov yeeb yaj kiab tawg.

Qhov thib peb yog tias yuav tsum muaj lwm cov khoom xyaw hauv koj cov khoom, kom qhov kub thiab txias tsis tuaj yeem yaj nws, thiab cov cua tshuab yuav tshwm sim los ntawm ib qho, uas yuav ua rau cov yeeb yaj kiab tawg.