Tsis yog- cov ntawv hlau txheem yog hais txog cov khoom siv hlau ua raws li cov neeg siv khoom xav tau, tsis ua raws li cov qauv loj thiab cov qauv tsim. Nws cov yam ntxwv tseem ceeb suav nrog tsis yog - qhov ntev ntawm tus qauv, cov qauv hloov pauv, thiab tseem ceeb rau tus kheej thiab kev hloov kho. Nws muaj ntau yam kev siv, suav nrog cov khoom siv hauv tsheb, cov khoom siv hluav taws xob, thiab cov khoom siv hauv tsev, uas muaj cov kev cai tshwj xeeb rau cov khoom loj, cov duab, lossis kev ua haujlwm.
Tsis yog- cov qauv ntawv hlau, piv rau cov ntawv hlau txheem, tsis ua raws li qhov loj me thiab cov qauv txheej txheem tab sis tau ua raws li cov kev xav tau tshwj xeeb ntawm cov neeg siv khoom. Nws cov yam ntxwv tseem ceeb suav nrog tsis yog - qhov ntev ntawm tus qauv, cov qauv hloov pauv, thiab tseem ceeb rau tus kheej thiab kev hloov kho. Cov yam ntxwv no ua rau tsis yog- cov qauv ntawv hlau kom ua tau raws li qhov yuav tsum tau ua, kev tsim qauv, thiab kev zoo nkauj ntawm cov xwm txheej tshwj xeeb. Hais txog ntawm daim ntawv thov, cov ntawv tsis yog- qauv hlau yog siv dav hauv cov khoom siv tsheb, cov khoom siv hluav taws xob, thiab cov khoom siv hauv tsev, qhov twg muaj cov kev xav tau tshwj xeeb rau cov khoom loj, cov duab, lossis kev ua haujlwm, thiab tsis yog - cov ntawv hlau txheem tuaj yeem ua tau raws li cov kev xav tau no. Tus yuam sij los daws qhov teeb meem no yog nyob rau hauv kev nkag siab qhov tseeb ntawm lub ntsiab lus ntawm cov ntawv tsis yog - qauv hlau thiab muaj peev xwm piav qhia tau nrog nws cov yam ntxwv thiab daim ntawv thov.
