显然，地球是唯一无法证明的财产。

Apparently earth was the only property that wasn't provokable.

youdao

如果它没能hold water，那它就是不可靠且无法证明的。

If it does not hold water, then it is weak and not worth debating.

youdao

世界教会委员会的Jerry Handspicker 说“上帝已承受了很多证明根本无法证明的努力。”

"God, " says Jerry Handspicker of the World Council of Churches, "has suffered from too many attempts to define the indefinable."

youdao

How do we prove the existence of things we can't see or hear or taste and so forth?

我们如何能证明那些,我们无法依靠五感感知的事物呢

耶鲁公开课 - 死亡课程节选