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。
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。
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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