Our parents love us because we are their children and this is an unalterable fact, so that we feel safer with them than with anyone else.

我们的父母爱我们是因为我们是他们的子女，这是不可改变的事实，所以和父母在一起时我们会感到比和其他任何人在一起时都安全。

youdao

This is regarded as part of the nature of things, and generally as an unalterable fact.

这被看成是事物本质的一部分，而且是一个无法改变的事实。

youdao

This is an unalterable fact of life given the inherent and severe limitations associated with even the best CW protective gear and most highly trained troops.

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