Cov txheej txheem kev khiav hauj lwm rau ib daim ntawv pov tseg suav nrog ntau cov kauj ruam tseem ceeb xws li kev npaj cov cuab yeej siv, cov kauj ruam ua haujlwm, kev ceev faj txog kev nyab xeeb, thiab kev kaw lub kaw lus. Cov ntawv khib nyiab yog qhov tseem ceeb hauv kev lag luam niaj hnub siv dua tshiab, dav siv rau compressing thiab baling khib nyiab ntawv, cardbo ...
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