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。

youdao

She was held back by some sense of self-preservation.

一种自我保护意识使她没有贸然行动。

《牛津词典》

The police have the same human urge for self-preservation as the rest of us.

警察和我们其他人一样，都有自我保护的人类本能。

《柯林斯英汉双解大词典》

"Self Preservation is no longer important to me, " the manifesto said at one point.

CNN: STORY HIGHLIGHTS

The intelligence also suggests that he did provide sensitive information to PIRA and that he did so "for reasons of self preservation".

BBC: Dublin reporter

Self Preservation is no longer important to me.

CNN: STORY HIGHLIGHTS