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我们需要建造一个多大规模的宇宙飞船,才能满足人类长期太空旅行,栖息繁衍的需要? |
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发表于 2018-11-7 21:34:04
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发表于 2018-11-7 21:34:10
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发表于 2018-11-7 21:34:52
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发表于 2018-11-7 21:35:40
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