Raws li qhov loj me ntawm qhov ntsuas, cov kab ntau lawm tuaj yeem muab faib ua cov khoom lag luam ntau lawm thiab cov kab ntau lawm. Cov khoom lag luam ntau lawm kab kev ua haujlwm ntawm kev tsim khoom ua haujlwm ntawm qee hom khoom lag luam, los ntawm raw khoom moulding, nrog cov txheej txheem sib xws thiab muaj txiaj ntsig. Feem ntau cov kab tsom rau kev tsim ib lossis qee qhov ntawm cov khoom lag luam, muab cov khoom siv uas ua tau rau kev ua haujlwm txuas ntxiv.
Raws li kev ceev ntawm cov lus sib dhos, lawv tuaj yeem faib ua ke kab thiab cov kab sib dhos. Nrog nws cov qauv txuas ntxiv thiab cov khoom sib dhos ua ke ua cov khoom txav txav ntawm cov chaw nres tsheb uas tau ua tiav lossis ua tiav cov haujlwm ua ntu zus lossis ua ke tsim nyog rau huab hwm coj ntau lawm. Cov kab tsis muaj kev sib dhos tau yooj yim hloov tau thiab tuaj yeem hloov kho raws sijhawm raws li cov kev xav tau kev tsim khoom. Lawv haum rau cov pob me me thiab ntau hom kev ua haujlwm ntau lawm.
Raws li cov degree ntawm kev siv tshuab, cov kab ntau lawm tau faib ua cov kab ntau lawm thiab tsis siv cov kab ntau lawm. Kev siv cov kab ntau lawm siv cov tshuab hluav taws xob siab, hluav taws xob, tshuab hluav taws xob kom ua tiav cov txheej txheem ntau lawm, txhim kho cov nqi ua haujlwm. Cov kab tsis siv hluav taws xob tsuas yog cia siab rau ua kom tiav ntau yam haujlwm ntau lawm, uas haum rau cov kev xav tau ntau dua lossis cov nqi sib txawv.
Ib qho ntxiv, raws li txoj haujlwm ntawm cov kab ntau lawm, nws kuj tuaj yeem muab faib ua kev ua cov kab ntau lawm, sib dhos hauv cov kab ntau lawm. Lawv tsom rau kev ua tiav, kev sib dhos thiab kev tshuaj xyuas zoo thiab ua ke cov khoom lag luam zoo thiab ntau lawm cov khoom lag luam.
