Cov txheej txheem ntxuav sib txawv yog xav tau rau cov khoom siv lom zem ua los ntawm cov khoom sib txawv. Kev tsis huv raws li cov khoom siv yuav tsis tsuas yog txo cov kev tu kom zoo xwb tab sis kuj tseem tuaj yeem ua rau cov khoom puas thiab ua rau nws lub neej luv. Yuav tsum tau saib xyuas ntxiv thaum ntxuav cov khoom siv hluav taws xob.
Ua ntej ntxuav cov khoom siv hluav taws xob, nco ntsoov xyuas kom lub hwj chim tawm kom tsis txhob muaj hluav taws xob poob. Tsis tas li ntawd, vim yog cov txheej txheem sab hauv ntawm cov khoom siv hluav taws xob, nws tsis tuaj yeem yaug ncaj qha nrog dej, vim qhov no tuaj yeem tso cai rau dej nkag thiab cuam tshuam rau nws txoj haujlwm ib txwm muaj. Yog li ntawd, nws raug nquahu kom siv cov ntaub mos muag lossis paj rwb swabs los ntxuav. Tom qab ntxuav, tos kom txog thaum cov cuab yeej qhuav qhuav ua ntej qhib lub hwj chim kom ntseeg tau tias siv tau zoo.
