cov khoom

Lub tes tsho kho zaj duab xis yog ib zaj duab xis ntawm cov khoom tshwj xeeb uas muaj qhov kub thiab txias uas siv los kho los ntawm lub tshuab luam ntawv lossis lub tshuab luam ntawv thaum luam lossis luam ntawv; kho yog cov txheej txheem ntawm kev kho cov duab tsis ruaj khov thiab tshem tawm cov toner ntawm daim ntawv theej rau daim ntawv, feem ntau yog kho tom qab lub fuser chav tsev yog rhuab, lub toner melts thiab ces nkag mus tob rau hauv cov ntawv fibers, uas yog cov nyhuv ntawm luam los yog luam ntawv.