Keeb kwm, txoj kev txo qis, lossis txheej txheem etching, tau tsim tom qab, tab sis hnub no nws tau siv dav tshaj plaws.Lub substrate yuav tsum muaj ib txheej hlau, thiab thaum lub pliaj qhov chaw raug tshem tawm tag nrho cov uas tshuav yog tus neeg xyuas pib qauv.Los ntawm kev luam ntawv lossis thaij duab tag nrho cov tooj liab raug xaiv yog xaiv ...
Nyeem ntxiv