英语翻译Yet this discovery had to happen at a certain point in t

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英语翻译
Yet this discovery had to happen at a certain point in time or another—it cannot have been happening constantly or have never happened yet still be present—and this point in time does have its own significance.
其中“it cannot have been happening constantly or have never happened yet still be present”如何翻译?"be"在句中的语法功能?

Yet this discovery had to happen at a certain point in time or another—it cannot have been happening constantly or have never happened yet still be present—and this point in time does have its own significance.
然而,这一发现必须发生在时间的某一点上或其他时间点上 - 它不能不断地一直在发生也不能从来不发生,而是它仍必须存在 ------- 并且这个时间上的点确实有其自身的重要性.
我认为我"be"在句中是与句子中 happen并列的不定式

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