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khoom

Kev kho zaj duab xis ntawm tes tsho yog ib zaj duab xis ntawm qhov kub siab tiv thaiv kub uas siv los kho los ntawm lub tshuab luam ntawv lossis luam ntawv thaum luam tawm; Kev kho yog txheej txheem ntawm kev txhim kho qhov tsis ruaj khov thiab lwv cov ntawv sau rau hauv daim ntawv, lub toner yaj tau sib sib zog nqus rau hauv cov ntawv fibers, uas yog cov nyhuv ntawm kev luam lossis luam ntawv.