Ntawm cov khoom noj me me uas cov menyuam noj, cov khoom ntim tau feem ntau muaj khoom plig, yog li ntau lub lag luam yuav txeeb lub hnub nyoog ntawm lub hom phiaj muag ntawm cov khoom ntim thiab muab qee yam khoom lawv nyiam, xws li daim npav, daim nplaum, thiab lwm yam. daim npav ntim thiab cov ntawv nplaum, yog tias lawv tau ntim ntawm tes, qhov kev ua haujlwm yog tsawg, tus nqi kuj tseem siab, thiab cov haujlwm ntim thiab ua tiav yuav ua tsis tiav sijhawm. Yog li no, lub sijhawm no, coob tus tub ua lag luam yuav siv daim npav rho nyiaj. Daim npav muab tshuab tuaj yeem siv tau los siv phau ntawv los faib cov npav tsis tu ncua. Daim npav pauv mus rau lub tshuab ntim khoom thiab lub pob ntim tshuab ntim ntawm lawv.
Qhov no ua rau cov khoom ntim tau yooj yim heev thiab ua rau kev ntim khoom zoo. Muab piv nrog cov phau ntawv ib txwm ntim, nws yuav tseeg tias ua cov khoom ntim tau ntxiv dua thiab zoo nkauj dua. Daim npav rho tawm tshuab, thaum lub sijhawm xa khoom, tsis tas yuav tsum tau saib xyuas phau ntawv tus kheej. Thaum tus naj npawb ntawm daim npav muab tawm tsis yog, nws yuav cia li nres thiab suab lub tswb. Lub sijhawm no, nws tseem tuaj yeem tso cai rau peb kom ua tiav cov teeb meem no, uas tiv thaiv nws kom tsis txhob ntim khoom. Muaj ntau ntau lossis tsawg dua ntawm daim npav khoom hauv pob ntawv. Kev siv daim npav rho tawm tshuab yuav tseeg tsis tau zoo txhim kho kev ua tau zoo ntawm kev ntim khoom thiab txuag nqi ntawm tib neeg cov peev txheej.