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有一个脑洞，如果举全人类之力来实现一个目标：如永生或者时间旅行，这个目标能够实现...
source link: https://www.v2ex.com/t/516749
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问与答 - @sabel - 如果能，需要多久呢?如果不能，制约人类实现这个目标的因素又是什么呢?欢迎大家各抒已见！！（ ps:我认为是人类自身躯壳的因素限制了人类实现这些目标！）
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