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Yas degradable
Taw qhia Cov yas degradable yog hais txog ib hom yas uas nws cov khoom muaj peev xwm ua tau raws li cov kev xav tau ntawm kev siv, kev ua haujlwm tseem tsis hloov pauv thaum lub sijhawm khaws cia, thiab tuaj yeem degraded ...Nyeem ntxiv
