An advantage of this kind of biomass is the fact they are generally lower-Price, involve negligible routine maintenance, and so are cultivated for biofuel production. → نَقِيٌّ čistý ren rein αγνός puro puhdas pur čist puro 純粋な 순수한 puur ren czysty puro чистый ren บริสุทธิ์ saf tinh khiết 纯�