Cov khoom

Cov khoom siv pob bearings uas thaiv hauv ncoo muaj cov kabmob ntxig uas tau teeb tsa rau hauv lub tsev hlau cam khwb cia uas tuaj yeem ntsia tau rau ntawm qhov chaw txhawb nqa. Cov qauv sab hauv ntawm cov kabmob ntxig yog tib yam li cov kabmob pob sib sib zog nqus. Tab sis qhov sib tw sab hauv ntawm cov kabmob no dav dua li qhov sib tw sab nraud. Qhov sib tw sab nraud muaj qhov chaw kheej kheej. Cov kabmob ntxig tuaj yeem sib phim nrog qhov sib haum ntawm qhov sib tw sab nraud thiab lub thaiv kabmob. Cov kabmob ntxig yog me me. Nws's yooj yim rau kev thauj khoom thiab tshem tawm.