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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Aggression is a kind of innate survival mechanism an instinct for self-preservation that allows animals to defend themselves from threats to their existence.

攻击是一种天生的自我保护的生存机制，它是一种允许动物保护他们自己免受威胁的生存方式。

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In recruiting an agent or "asset, " we were asking him to ignore the instinct of self-preservation, to break the laws of his own country to become a traitor.

WSJ: The Spy Who Turned Me