Cov yeeb nkab dabtsi yog khoov cov khoom lag luam yog ubiquitous thiab muaj ntau yam kev siv. Nyob rau hauv niaj hnub kev lag luam teb, yeeb nkab dabtsi yog khoov cov khoom muaj kev siv zoo. Rau cov neeg siv, txhawm rau kom ntseeg tau tias qhov ua tau zoo ntawm cov khoom siv khoov cov yeeb nkab, nws yog ib qho tsim nyog yuav tsum siv lawv kom raug raws li qhov yuav tsum tau ua.
Ua ntej, sim tsis txhob siv cov khoom siv khoov ncaj qha rau hauv kev kub ceev thiab ua haujlwm hnyav. Feem ntau hais lus, nws muaj peev xwm khiav mus rau ib lub sij hawm nyob rau hauv qis-ceev thiab tsis tshua muaj load tej yam kev mob kom haum rau lub xeev ua hauj lwm ua ntej kho. Cov khoom siv khoov cov yeeb nkab kuj yuav tsum tau muaj qee yam ntawm kev khiav hauv thiab hloov sijhawm.
Qhov thib ob, nws yog ib qho tseem ceeb kom tsis txhob nyem cov khoom thaum siv kom tsis txhob muaj teeb meem deformation, uas yuav cuam tshuam rau nws cov kev hloov pauv thiab txo nws txoj kev pab cuam lub neej.
Thaum lub sij hawm kev thauj mus los, kev siv, thiab kev teeb tsa, nws yog ib qho tseem ceeb kom tsis txhob muaj kev sib txhuam nrog lwm cov khoom kom ntau li ntau tau. Yog tias muaj teeb meem kev sib txhuam loj, nws yuav ua rau lub ntsej muag hnav thiab kub nce, ua rau tawg thaum ntxov lossis tawg.
Thaum siv cov khoom siv khoov cov yeeb nkab, nws yuav tsum tau ua tib zoo saib xyuas cov ntsiab lus saum toj no kom ntseeg tau tias kev ua haujlwm zoo thiab kev pabcuam lub neej ntawm cov khoom siv yeeb nkab khoov.