这个词是什么意思？
Systems that provide for the maintenance of life in an isolated living chamber through reutilization of the material available, in particular, by means of a cycle wherein exhaled carbon dioxide, urine, and other waste matter are converted chemically or by photosynthesis into oxygen, water, and food. (NASA Thesaurus, 1988)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018504 · MeSH 2026。
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