Zida zoyeretsera madzi ndi zida zofewetsa madzi zonse ndi zida zoyeretsera madzi, ndipo kusiyana kwawo kuli mumtundu wamadzi oyeretsedwa.Zida zoyeretsera madzi ndi chipangizo chomwe chimagwiritsidwa ntchito kuyeretsa madzi abwino, omwe amatha kuchotsa zolimba zoyimitsidwa, mabakiteriya, ma virus, zolemera ...
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