Nyob rau hauv kev tsim khoom ntawm cov pob txiv thiab cov pov tseg, cov khoom ua pob txiv tuaj yeem ua kom cov ntawv pov tseg hla rau sab nraud, sau cov ntim nrog cov ntawv pov tseg kom zoo siab kom ua kom nws zoo dua rau kev hla dej thiab ua kom zoo dua rau kev siv. Tom qab ntawd, cov khoom ua pob txiv tuaj yeem siv rau ntau yam kev tsim khoom ntawm cov khoom siv rau tsev nyob xws li cov pob txiv rau soob thiab cov pob txiv rau qab. Cov kev ua haujlwm ntawm cov khoom ua pob txiv ua kom zoo dua rau cov khoom siv thiab ua kom zoo dua rau kev dekor, ntxiv rau qhov ua kom sov dua rau hauv tsev.
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