Dab tsi yog pwm tsim thiab kev tsim khoom?Pwm tsim thiab tsim khoom yog cov cuab yeej tshwj xeeb, nws cov haujlwm tseem ceeb yog tsim thiab tsim cov hlau, yas, roj hmab thiab lwm yam khoom siv molding cov cuab yeej thiab pwm.Qhov loj no suav nrog ntau qhov chaw, suav nrog kev tsim pwm, kev tsim khoom, kev sib tw ...
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