I could have told him all this, but it was fairly obvious he wasn't going to be around long enough for it to matter.
结构是:long enough (for ...) to do sth.
意思是:时间够长的,(对......而言)可以做某事。
it 指代“告诉他一切”;to matter(动词不定式),意为“很重要;很要紧;意义重大”。
he wasn't going to be around long enough for it to matter.
【翻译】他不会待得太久,告诉他就不重要了。(由于前面否定,不定式动作自然跟着否定)
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