Feem ntau, tsuas yog cov kws tshaj lij lossis cov neeg ua haujlwm nrog cov hlau feem ntau yuav tuaj yeem txheeb xyuas qhov sib txawv ntawm cov hlau. Ua li no, lawv ua ntau hom kev ntsuam xyuas ntawm cov hlau, vim nws yuav luag tsis yooj yim sua kom sim txheeb xyuas lawv tsuas yog los ntawm lawv cov tsos.
Cov kev ntsuam xyuas no suav nrog kev ntsuas hluav taws xob, ntsuas hlau nplaum, ntsuas nti, ntsuas qhov tawv, thiab ntsuas qhov pom ntawm qhov chaw. Kev txheeb xyuas ntawm hom hlau tuaj yeem ua tiav los ntawm kev tshem tawm cov khoom siv raws li kev paub txog kev ua haujlwm ntawm cov khoom sib txawv uas muaj nyob hauv ntau hom.
