Ua ntej, cov nyhuv polishing
(1), tshem tawm cov xim zoo khawb (khawb plaub hau).
(2), kev kho ntawm cov xim pleev xim rau lub tsheb me me puas thiab ntau yam; Txhawm rau ua tiav qhov ci thiab tsis muaj qhov ua tiav.
Ob, qhov tseem ceeb ntawm polishing kos duab polishing tuaj yeem tsim cov xim zoo nkauj thiab tsis muaj qhov tsis zoo, tsis tuaj yeem sib cais los ntawm nws cov txiaj ntsig zoo nkauj, txhawm rau ua tiav lub hom phiaj saum toj no,
Feem ntau hais lus, muaj peb txoj hauv kev;
(1) tso siab rau kev sib tsoo, uas yog, tso siab rau cov khoom tswj kev sib txhuam kom tshem tawm cov khawb zoo.
(2) vam khom lub tsheb ciab, feem ntau ntawm tus neeg sawv cev polishing muaj lub tsheb sib xyaw ua ke, polishing rau qee qhov, tuaj yeem tso siab rau cov lus ci ci los kho qhov tsis xws luag ntawm cov xim.
(3) vam khom cov tshuaj tiv thaiv kab mob, los ntawm kev siv lub tshuab ua kom nrawm nrawm thiab txhuam tus neeg sawv cev tshuaj lom neeg cov tshuaj tiv thaiv.
