for small scale and controlled environment you can built
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送交者: steven 于 2007-05-22, 13:51:45:
回答: How about built a turely self-susteined one? 由 蓝隼 于 2007-05-22, 13:29:34:
a self-sustaining system> However, during space flight, many things can happen, plus a spaceship loses heat all the time, and that means the system isn't a closed-system.
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