Raws li koj paub, ntaub yog ib qho tseem ceeb heev rau lub tsoos tsho. Yog li hnub no cia peb kawm ntxiv txog ntaub. Cov ntaub ntawv ntaub (cov ntaub ntawv feem ntau muaj xws li: muaj pes tsawg leeg, dav, gram hnyav, muaj nuj nqi, sanding nyhuv, tes xav, elasticity, pulp txiav ntug thiab xim ceev) 1. Composition (1) ...
Nyeem ntxiv