Bearings, uas yog ib qho tseem ceeb ntawm cov khoom lag luam, tuaj yeem pom nyob txhua qhov chaw hauv txhua lub ces kaum ntawm lub neej, txawm tias nws yog kev tsheb ciav hlau ceev, dav hlau thiab lwm yam tsheb loj, lossis khoos phis tawj, tsheb thiab lwm yam khoom uas tuaj yeem pom txhua qhov chaw hauv lub neej, lawv yuav tsum tau siv rau hauv kev tsim khoom. ...
Nyeem ntxiv