Kev ntxuav, lubrication, kev tshuaj ntsuam thiab kho raws li qhov chaw, kev tu ncua yuav tsum tau nqa tawm raws li yuav tsum tau ua thaum thiab tom qab ua haujlwm ntawm lub tshuab.
Thawj theem haujlwm ua haujlwm yog ua tiav raws li kev saib xyuas txhua hnub. Cov hauj lwm tseem ceeb yog ntub, zawm thiab soj ntsuam txhua qhov chaw thiab lawv cov haujlwm tu.
Qhov haujlwm ua haujlwm thib ob tsom rua kev tshuaj xyuas thiab kev hloov. Tshwj xeeb kos lub cav, txoj hlua, kis, kis cov khoom, kev thev thiab nres cov khoom.
Kev txhim kho qib thib peb theem siab yog txhawm rau txhom, kho, teeb meem thiab sib npaug ntawm txhua yam khoom. Kev kuaj mob thiab kuaj xyuas cov khoom uas cuam tshuam rau kev ua tau zoo ntawm cov cuab yeej thiab cov khoom uas muaj qhov cim txhaum plaub, thiab ua tiav cov kev hloov, kev kho thiab kev txhim kho.