Vim li cas siv cov kub khiav pwm
Txo cov khib nyiab thiab ua kom zoo dua qub;
Txo cov khoom deformation thiab txhim kho cov khoom muag;
Txhim kho cov khoom tsim tau thiab paub tsis zoo tuaj;
Nthuav thiab txhim kho cov khoom sib luag thiab sib npaug;
Shorten lub voj voog molding
