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vk lam co kha nang quang hop tao oxi,vay tai sao o mot so ao ho vao mua he co hien tuong 'nuoc no hoa' la do vk lam sinh truong manh lai lam cho cac sinh vat duoi ho bi chet?dang le ra vk lam nhieu thi se nhieu oxi va sinh vat co loi moi dung chu.