Lub tuam txhab tshiab ntxiv cov khoom siv sib tsoo, tus nqi ntawm lub nplhaib sab hauv thiab sab nraud ntawm lub hauv ncoo thaiv kev coj tus kheej kom ntseeg tau tias qhov zoo, txo tus nqi, xyuas kom zoo thaum xyuas kom meej tias tus nqi zoo dua ntawm cov khoom. Paub txog qhov kev pabcuam ib-nres ntawm kev tsim khoom thiab kev muag khoom. Lub hauv paus lav qhov zoo ntawm cov khoom