Txhua lub sijhawm uas tig mus los yooj yim, txhua qhov chaw nres tsheb uas muaj kev ntseeg siab, thiab txhua mais uas ntsiag to muaj ib feem tseem ceeb heev: lub log bearing. Nws yog ib feem uas feem ntau cov neeg tsav tsheb yeej tsis xav txog, tab sis nws qhov kev ua tau zoo yog qhov tseem ceeb rau kev nyab xeeb, kev ua haujlwm zoo, thiab kev nplij siab ntawm txhua lub tsheb. Kev xaiv lub log bearing kom raug...
Kawm Ntxiv