<prompt> Translate the following text to EnglishMaendeleo katika teknolojia ya FGD, kubuni, vifaa, na utaalam inapatikana kwa ajili ya mitambo ya retrofit alifanya zaidi ya muongo uliopita fomu tofauti kali na mifumo ya zamani retrofit.  <response>: Advances in FGD technology, design, materials, and expertise available for retrofit installations made over the last decade form a sharp contrast to earlier retrofit systems. 