In prehistoric times,the physical changes in response to str

In prehistoric times,the physical changes in response to stress were an essential adaptation
the physical changes in response to stress were an essential adaptation for meeting natural threats.
请问这句话的语法结构如何理解?
为什么必须要用介词"for"?

captainduan 1年前已收到2个回答举报

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主句是the physical changes were an essential adaptation.生理变化是一种基本的适应性反应.in response to stress 对于压力的,修饰changesmeeting natural threats 面对自然威胁,即在面对自然威胁时的适应性反应ad...

1年前

cityhoner 幼苗

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for 在这里是"为了"的意思啊,
在史前时代,在压力作用下身体上的变化是为了顺应自然的威胁而产生的必要适应。

1年前

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