1. Kev Ncaj Ncees Txawm tias nws yog ib txoj hlua khi los yog sib koom ua ke, nws yuav tsum xoob, puag ncig, rog thiab txawm.Yog tsis muaj unevenness thiab unevenness nyob rau hauv thickness.2. txhais tes zoo li mos (muab) nrog kev ruaj khov, tsis pom kev thiab tsis muaj "pob txha", lossis ha...
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