Cov kabmob pob yog ib yam ntawm cov kabmob sib dhos. Lub pob hlau kheej kheej hlau tau teeb tsa nruab nrab ntawm lub nplhaib sab hauv thiab lub nplhaib sab nrauv kom txo qis kev sib txhuam hauv cov txheej txheem xa hluav taws xob thiab txhim kho kev sib kis tau zoo ntawm cov tshuab siv zog los ntawm kev dov.
Pob bearings tsis tuaj yeem tiv taus cov khoom hnyav thiab hnyav thiab muaj ntau nyob hauv cov tshuab siv tshuab. Pob bearings tseem hu ua pob bearings.
