问题源于这一简单的事实…

The problem was due to the simple fact that...

《牛津词典》

这个简单的事实是：对大多数人来说，网上冲浪费用太高，无法经常进行。

The simple fact is that, for most people, surfing is too expensive to do on a regular basis.

《柯林斯英汉双解大词典》

一个简单的事实是，并非历史上的一切都能在历史进程中幸存。

The simple fact is that not everything from history survives the historical process.

youdao

The objects don't get put back together," One possibility, of course, is simply to disagree with me about the facts.

物体不能再复原了“,一种可能性，当然，是简单地不同意我对于这些事实的观点。

耶鲁公开课 - 死亡课程节选

And so, that simple fact is why we would expect animals to care for their children, because children are the means through which genes replicate.

所以，简单的事实是,我们为什么期待动物关心后代，因为后代是基因繁衍的方式。

耶鲁公开课 - 心理学导论课程节选

I think the simple fact of the matter is we don't know enough about consciousness yet to know whether or not it can be explained in physical terms.

一个简单的事实就是,我们对于意识了解甚少,还不知道是否能使用物理的方式对其进行解释

耶鲁公开课 - 死亡课程节选