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地球出现生命，究竟是多么微小的概率？地球有多特殊？
银河系几千亿颗行星，为什么只有地球才能产生生命？宇宙无边无际，仅仅银河系就有几千亿颗行星，为什么目前只有地球才出现了生命呢？地球到底有多么的特殊？地球到底有多少奇迹的重合！
神奇的宇宙21/57
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