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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"I have an instinct for survival, for self-preservation," he reflects.

“我要生存，我要自我保护，这就是我的本能，”他会这样想。

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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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Few are likely to accept that they are duty-bound to follow opinion polls, even if their instinct for self-preservation may drive them in that direction.

ECONOMIST: The last mile

Bagehot had expected the Conservatives' instinct for self-preservation to silence this internal conversation for at least the final few weeks before polling day.

ECONOMIST: Bagehot: And now that you haven’t voted... | The

In a situation like that, every instinct pushes us towards self-preservation.

WHITEHOUSE: President Obama Speaks at the National Peace Officers�� Memorial Service | The White House