(I) In the early 1990s, NASA engineers began testing whether a closed-loop filtration system could purify water for long-duration space missions. (II) The system relied on a combination of physical filters and chemical treatments to remove contaminants from wastewater. (III) Early prototypes struggled to remove trace amounts of pharmaceutical residues from recycled water. (IV) The International Space Station uses solar panels spanning the length of a football field to generate electricity. (V) By the early 2000s, an improved version of the system was capable of recycling over 90 percent of onboard wastewater for reuse.
Neden?
Paragraf, NASA'nın kapalı devre su arıtma sistemini geliştirme sürecini sırayla anlatır: tasarım, ilk denemelerdeki sorunlar ve 2000'lerin başındaki başarı. Uluslararası Uzay İstasyonu'nun güneş panelleriyle elektrik ürettiğini söyleyen cümle ise enerji üretimine geçerek su arıtma zincirinin dışında kalır.
PARALLEL BASE · Q78