NREL is building biorefinery technologies for converting biomass into An array of precious fuels, substances, elements, and products—very like oil refineries and petrochemical plants do.→ نَقِيٌّ čistý ren rein αγνός puro puhdas pur čist puro 純粋な 순수한 puur ren czysty puro чистый ren บริสุทธิ์