Cov kabmob nrawm yog qhov nrawm heev, qeeb thiab nrawm, sab hauv kev sib txhuam cov kabmob, feem ntau yog qhov kev txwv ntawm cov kabmob hauv qhov ceev ntawm qhov kub nce, yog li thaum lub nra nra dhau qhov kev txwv tsis pub dhau lub nra yuav tsis tig mus dhau lub sijhawm vim muaj kev sib txhuam ntau dhau, kev coj tus kheej ntawm qhov kev txwv ceev txhais tau tias tsis ua kom muaj kev sib txhuam thaum tshav kub kub, thiab tuaj yeem, yog li ntawd, qhov pib ntawm lub nruam kev sib hloov cov kabmob ceev, yog nyob ntawm seb hom kabmob, suav nrog qhov npliag ntawm qhov loj me, thiab tseem yog txoj kev thiab lub lubrication, qhov zoo ntawm cov roj nplua nyeem yuav tsum khaws nrog hom kev sib tw yog tib yam.
Txhua yam ntawm cov kabmob nrog roj lubrication thiab roj lubrication, lub sijhawm no lub nrawm nrawm feem ntau nyob rau hauv txhua tus kabmob qhov loj me ntawm lub rooj, suav nrog cov lej sawv cev tus qauv tsim ntawm cov kabmob raws li kev pabcuam dav dav hloov kho kev sib hloov ceev tus nqi, ntxiv rau, cov roj nplua raws li qee hom kev lag luam, kuj tuaj yeem ua rau kev ua haujlwm tsis zoo, thaum kho cov kev txwv ceev peb kuj xav ua ntau yam teeb meem cuam tshuam, cov teeb meem no yog cov teeb meem ntawm cov chaw tsim khoom lag luam, nrog cov xibfwb loj dua, los tham txog.