defence mechanism

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I’d never allowed anyone to be special to me. I’d developed a defence mechanism to push away the girls I knew, in an attempt to achieve the opposite of previous relationships.
我从来没有让一个人在我生活中边的很特别，我不知觉的建立起来一套女孩防御机制，视图达到以前失败的感情经历的相反的结果。
This is a recognised defence mechanism and has been mentioned in other invertebrates, but no one had published on what exactly makes them do it or whether it actually is effective against predators.
这种防御机制已经为人所熟识了，而且在其他一些无脊椎动物中也有发现。但是目前还没有报道说明是什么使得它们形成这样的机制，也不知道这是否可以有效地反抗捕食者。
It is the defence mechanism that is at work when we use time or an ideal as a means of gradual transformation.
当我们采用时间作为一种渐变的工具的时候，这是防备机制在起作用。

Instead of trying to grapple with every single one of the risks around them, investors should emulate the lowly cockroach, which has survived for millions of years thanks to a defence mechanism that is rudimentary but good at dealing with unanticipated threats.
ECONOMIST: Financial markets: Copy the lowly cockroach The

an automatic way of behaving or thinking by which you protect yourself from something, especially from feeling unpleasant emotions

A defence mechanism is a way of behaving or thinking which is not conscious or deliberate and is an automatic reaction to unpleasant experiences or feelings such as anxiety and fear.