And these are using the technology to augment the real experiments with virtual atoms that show these things are really there but you can't normally see.

他们在使用这些技术,来积累实际经验,通过模拟原子,使这些东西实际存在,但一般不可见。

麻省理工公开课 - 媒体、教育、市场课程节选

In contrast, on the whole other side, you've got 3 things that are invisible, like the number 3.

相反地，另一方面,有些不可见的东西，例如数字。

耶鲁公开课 - 死亡课程节选

These invisible, vague things can never form the basis of a serious science.

这些不可见，定义模糊的东西,不能被划入严谨的科学范畴里。

耶鲁公开课 - 心理学导论课程节选

Milton's blindness, the fact of his blindness, has shut out his view of the visible world, which would ordinarily present itself to him through the entrance of his eyes; and this shut-out will enable him, will help him, explore the invisible world of divine truth.

弥尔顿的失明，他失明的这个事实，遮住了,他看具体世界的目光，他通常是通过双眼,这个通道来看具体世界的，不过这种蒙蔽帮助了他，使他能够探索不可见世界中的神圣真理。

耶鲁公开课 - 弥尔顿课程节选

it's clear that you want to add a vector that looks like that, because then you go from the start of this to the finish of that, you end up at the same point and you get this invisible 0 vector.

显然应该给它加上这样一个矢量,因为从这个矢量的起点指向那个矢量的终点,最终指向的是同一个点,你就得到这个不可见的零矢量

耶鲁公开课 - 基础物理课程节选

OK, you've actually seen exceptions a lot, you just didn't know that's what they were, because exceptions show up everywhere in Python. Let me give you a couple of examples.

好的，你们实际以及看过很多异常了，你就是不知道这些是什么，因为异常在Python中随处可见,我给你举些例子。

麻省理工公开课 - 计算机科学及编程导论课程节选

Things that are invisible never change.

不可见的东西永远不变。

耶鲁公开课 - 死亡课程节选