It means that the properties of the system, the properties that describe the system, don't change in time or in space.

它的意思是指，用以描述系统的性质，不随时间或空间改变。

麻省理工公开课 - 热力学与动力学课程节选

So first I'm gonna say something about identity across time or indeed initially identity across space with some familiar humdrum material objects.

所以我首先要,用一些大家熟悉的一般实物,谈谈贯穿时间,和贯穿空间中的人格。

耶鲁公开课 - 死亡课程节选

We're going to keep using the things that exist in space, virtual or not, and the things that unfold in time in their relationship with each other as we continue to try to understand these basic principles which shape so much of subsequent literary theory. Thank you.

我们将继续解释事物的存在，无论它们是否可见，我们会学习语言在一段时间里的关系,随着我们继续学习这些基本的概念,我们会进一步理解文学理论，谢谢。

耶鲁公开课 - 文学理论导论课程节选

It doesn't really matter as long as we're comfortable talking about entire space-time worm, the car and the slices, or the stages.

只要我们接受,它整个是条时空虫,可以接受它的切分，阶段,这样就可以了。

耶鲁公开课 - 死亡课程节选

And we're asking: Is that the very same space-time worm as the one we picked out previously or a different space-time worm ? than the one we picked out previously?

然后我们问：,这条时空虫,跟我们之前指的一样吗,还是和我们之前指的,不是同一条时空虫？

耶鲁公开课 - 死亡课程节选

So I would help myself to this language of space-time worm object that extends not only over space but also over time, and distinguish the entire worm from the various slices or stages that either make up the worm or we could slice the worm into.

然后我借助时间虫这个词,这是描写物体,贯穿时间和空间的词语，并区分出整条虫,和不同的部分,这些部分是组成虫，或者虫可以切分成的。

耶鲁公开课 - 死亡课程节选