Biraha culus waa koox ka kooban walxaha raadraaca oo ay ku jiraan biraha iyo biraha sida arsenic, cadmium, chromium, cobalt, copper, iron, lead, manganese, mercury, nickel, tin iyo zinc. Iions birta waxaa lagu yaqaanaa inay wasakheeyaan ciidda, jawiga iyo nidaamyada biyaha waana sun...
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