• 1. existence and survival: 存在与生存
• 2. cognition of survival and existence: 生存存在认识论

• 1.The mere existence of such a civilisation will tell us that long-term survival is possible, and gives us some cause for optimism.
  这样一种文明的存在本身就会告诉我们，长期生存是可能的，并给我们一些乐观的理由。
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• 2.Aggression is a kind of innate survival mechanism, an instinct for self preservation, that allows animals to defend themselves from threats to their existence.
  攻击性是一种天生的生存机制，一种自我保护的本能，使动物能够保护自己不受生存威胁。
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• 3.Modern humans have lived for most of their existence as hunter gatherers, so much of human nature has presumably been shaped for survival in such conditions.
  现代人多数时候以狩猎采集为生，人性的很大一部分可能是在这种生存条件下形成的。
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