Qhov chaw sov zog tuaj yeem siv los ntawm kev lag luam ntau yam, xws li kev tsim khoom. Lawv muab kev txheeb xyuas qhov loj, lossis qhov nyiag, ntawm cov duab plig hluv tshuab nyob rau hauv qhov sov zog siab. Qhov nyiag yog qhov muab nqi rau vim li cas ib qho duab plig hluv tshuab tau dhau. Piv txwv li, neeb yog nyiag thiab nws dhau chaw yeej meem; nplooj npau lossis duab plig hluv tshuab uas zoo sib xws, yuav dhau yooj yooj. Kev paub qhov nyiag yog tseem ceeb vim nws txiav txim seb yam khoom tau tsim li cas thiab nws ua haujlwm li cas. Cov neeg tsim khoom tuaj yeem tsim khoom zoo dua thaum lawv paub tias qhov nyiag ntawm lawv khoom tau tsim li cas. ZONWON feem ntau nyob rau hauv qhov chaw sov zog kom cov neeg lag lag luam tuaj yeem muab qhov ntsiab lus ntawm qhov nyiag. Qhov no cuam tshwm khoom zoo dua thiab tus neeg siv khoom zoo dua.
Kev siv ntawm Roj khaub ncaws siv roj khaub ncaws nyob rau hauv kev tsim kho tuaj yeem pom los ntawm kev pab cuam tshwm sim ntawm qib muaj zog ntawm khoom. thaum cov neeg tsim kho siv cov noj me num no, lawv tuaj yeem sau nrog rau cov duably ntawm lub teeb degrees uas yuav raug siv. rau cov duably tshwj xeeb, yog li cas vim tias lawv hloov siab hauv qhov chaw ua kom sov. piv txwv li, dej nkag hlau lossis lub hom dej av twg tuaj yeem xwm txoj hauv kev nyiam differently thaum kub. yog tias cov neeg tsim kho tsis ntsuas kev nyiam siab nyob rau hauv lub teeb degrees tseem ceeb, lawv tuaj yeem pom tias muaj khoom uas tsis ua haujlwm zoo. muaj cov ntsuas ntsuas degrees kub, cov neeg laij khom tuaj yeem paub meej tias siv cov duably thaum uas yuav muaj feem nyob tom qab nws sov. nov cuaj npe rau meej dua thiab khoom zoo dua.