It's hard to explain exactly what it is, It's not getting lost.

很难解释它到底是什么，不是迷途。

普林斯顿公开课 - 人性课程节选

It's hard to explain. I'm not an expert, so I just...

这很难解释。我不是一个专家，所以我只能……

英国的啤酒 - SpeakingMax英语口语达人

It's very hard to see how you explain that in physicalist terms.

都很难运用物理主义术语加以解释

耶鲁公开课 - 死亡课程节选