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How Space Stations Recycle Water and Regenerate Oxygen
空间站循环水与氧气再生
精读先不看文字，完整听一遍。
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On the International Space Station, every drop of water is recycled repeatedly to reduce resupply needs.在国际空间站上，每一滴水都经过反复回收，以减少补给需求。
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Urine, sweat, and cabin humidity are collected and purified using multi-stage filtration and catalytic reactors.尿液、汗液和舱内湿气被收集起来，通过多级过滤和催化反应器净化。
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The Water Recovery System removes contaminants and kills microbes with iodine and high-temperature catalysis.水回收系统利用碘和高温催化技术去除污染物并杀灭微生物。
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Recovered water meets strict NASA standards and is safe enough to drink, though astronauts rarely do so.回收的水符合美国宇航局严格标准，安全可饮用，但宇航员极少饮用。
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Oxygen is regenerated mainly through electrolysis—splitting recycled water into hydrogen and oxygen gases.氧气主要通过电解再生——将回收的水分解为氢气和氧气。
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The oxygen gas is released into the cabin air, while hydrogen is combined with carbon dioxide to make water and methane.氧气释放到舱内空气中，氢气则与二氧化碳结合生成水和甲烷。
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Carbon dioxide removal uses amine beads that absorb CO₂ from cabin air during normal breathing cycles.二氧化碳清除采用胺基微珠，在乘员正常呼吸周期中吸附舱内CO₂。
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This closed-loop system recovers over 90% of water and about 40% of oxygen onboard.该闭环系统可回收超过90%的水和约40%的氧气。
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Without such recycling, the ISS would need hundreds of kilograms of new water and oxygen each month.若无此类回收，国际空间站每月需补充数百千克新水和氧气。
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These life-support technologies also guide future designs for Moon bases and Mars missions.这些生命保障技术也为未来月球基地和火星任务的设计提供指导。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Oxygen is regenerated mainly through electrolysis—splitting recycled water into hydrogen and oxygen gases. 氧气主要通过电解再生——将回收的水分解为氢气和氧气。
- These life-support technologies also guide future designs for Moon bases and Mars missions. 这些生命保障技术也为未来月球基地和火星任务的设计提供指导。
- The Water Recovery System removes contaminants and kills microbes with iodine and high-temperature catalysis. 水回收系统利用碘和高温催化技术去除污染物并杀灭微生物。
④ 懂 · 选一选
⑤ 今天会说这一句
Oxygen is regenerated mainly through electrolysis—splitting recycled water into hydrogen and oxygen gases.
⑥ 跟读并录音
Oxygen is regenerated mainly through electrolysis—splitting recycled water into hydrogen and oxygen gases.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Oxygen is regenerated mainly through electrolysis—splitting recycled water into hydrogen and oxygen gases.
已记下。连续天数以后会显示在课表里。
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