Kub yaj lub nplaum zaj duab xis yog ib hom khoom siv uas tuaj yeem ua kom kub-ua rau sib khi los ua cov zaj duab xis nrog qee qhov tuab, thiab kub yaj nplaum nplaum ua ke yog ua los ntawm cov khoom siv. Kub yaj ntaub nplaum zaj duab xis tsis yog tag nrho cov nplaum, tab sis ib hom kua nplaum. Xws li PE, EVA, PA, PU, PES, hloov kho polye ...
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