Qhov ruaj khov ntawm ntsia thawv - kua nplaum dawb nyob ntawm cov kwv uas tau nyab xeeb. On tiaj tiaj, ntsia thawv - kua nplaum dawb yog qhov ruaj khov thiab tuaj yeem tuav cov khoom ruaj ntseg. Txawm li cas los xij, ntawm cov ntxhib, duab ntxoo, lossis tsis sib xws, qhov ruaj khov ntawm cov tawv nqaij {} Cov kua nplaum dawb tsis tuaj yeem lav, muaj peev xwm ua rau cov khoom poob.
Yog li ntawd, thaum siv ntsia thawv - kua nplaum dawb paug, nws yog ib qho tseem ceeb kom paub meej tias cov khoom siv tau ruaj thiab cov txheej txheem saum npoo kom ntseeg tau cov ntawv txuas ruaj khov.
