能看见他们的眼睛，但你看不见他们的鼻子和嘴巴。

You see their eyes, but you don't see their nose and mouth.

youdao

你能感受到我的，但你看不见我的春天，我可以为你工作，但你不能碰我。

You can feel my, but you can't see my. I can work for you but you can't touch me.

youdao

另一种爱像空气，它虽然无所不在，无所不包，但你看不见，摸不着，所以你常常不会意识到它的存在。可是一旦没有了这空气，你会感到一分钟也不能呼吸，无法生存。

The other kind of love is like the air:you are surrounded by it and you don't feel its existence, but if the air disappears, even for a minute, you cannot survive.

youdao

Because the brain in front of you-- you can't see it,but it's in front of you-- the brain in front of you is the very same brain as the brain that you had in front of you on Thursday.

是因为你们面前这个大脑的存在-,你看不见，但其确实是存在的-,你们面前的这个大脑,和周四那个大脑是一样的。

耶鲁公开课 - 死亡课程节选