I don't--not only can't I feel anything with my fingers, I don't have any sensations where my body should be.

我不但无法用手指感触任何事物,也无法感知躯体的位置

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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

but it's not invisible if we mean definition No. 2 can't be sensed. Can't be observed.

但如果取第二个定义它就不再无形2,无法感知，不能观察。

耶鲁公开课 - 死亡课程节选