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

it's the study of how languages change over time.

它研究的是语言的历史变化。

我的专业 - SpeakingMax英语口语达人

Every time they're changing You know everytime I say change, and eventually you will be hearing there's the same change, too.

他们变化的时候,你知道当我说,变,的时候,你听到的音乐也随之改变了

耶鲁公开课 - 聆听音乐课程节选

But luckily for us, there's a classical equation of motion that will, in fact, describe how the electron and nucleus change position or change their radius as a function of time.

但幸运的是，有一个,经典方程描述了电子和核子,位置或者它们直接的距离是,如何随时间变化的。

麻省理工公开课 - 化学原理课程节选

I'm thinking about a problem, I'm going to show you an example in a second, first thing I'm going to do is say, what is the thing that's going to change every time I run through the same set of code?

我要解决一个问题，我马上会让大家看一个例子，第一件我要做的事情就是,弄明白每次运行同样的指令集时,每次都会改变的东西是什么？

麻省理工公开课 - 计算机科学及编程导论课程节选

Sometimes the old aristocracy will be able to hold on for a very long time and to suppress any attempt to change things.

有时一些老贵族,会冥顽不灵,固执己见,试图遏止这些变革力量

耶鲁公开课 - 古希腊历史简介课程节选

OK, we're going to do this reversibly, which means we're going to slowly change the external pressure very, very slightly at a time, so that at every point we're basically in equilibrium, p2/ until the pressure reaches a new smaller pressure p2.

整个过程保持可逆，外界压强,变化得很慢，每一个瞬间,都保持平衡，直到压强减小到末态值。

麻省理工公开课 - 热力学与动力学课程节选

Last time we stopped, we talked about how difficult change is.

上次我们讲到改变有多么困难。

哈佛公开课 - 幸福课课程节选

Now,that has changed, for sure; but,the centralization of the French government and the domination of Paris over the life of the nation is very difficult to change, over a long period of time.

现在,情况已经发生了改变,但是法国政府的中央集权化,以及巴黎在国民生活中的支配地位,在相当时间段内,都很难得以改变

耶鲁公开课 - 1871年后的法国课程节选

The interesting thing is that through time, as political winds change, these taxes have changed and they've gone up to some very high levels in the past in the United States and other countries.

有趣的是在不同时期,如果政策方向有所转变,税率也会改变,在过去的美国和其他国家,税率曾经相当高

耶鲁公开课 - 金融市场课程节选

responding and serving American Express and more and more, this type of service provision giving them sort of English speaking trained manpower is available and giving time change...at night all services can be provided there and now including diagnosis... -Yes.

为美国快递公司提供服务,这种现象越来越多,这种服务,相当于提供给美国公司,训练有素的英文人力,而且可以承担晚班,这样公司就能提供全天候服务了,现在甚至可以代诊，-没错。

普林斯顿公开课 - 国际座谈会课程节选

Philosophers and psychologists knew for a long time that getting smacked in the head could change your mental faculties; that diseases like syphilis could make you deranged; that chemicals like caffeine and alcohol can affect how you think.

哲学家和心理学家在很久以前便知道,头部受到重创,会改变你的心理官能,像梅毒这样的疾病可以让你精神错乱,像咖啡因和酒精这样的化学药品,可以影响到你的思维

耶鲁公开课 - 心理学导论课程节选

What this really means is in a given time, the change in this quantity is a times the change in this quantity.

这里的真正含义是在给定的一段时间内,这个量的变化量等于,a乘以这个量的变化量

耶鲁公开课 - 基础物理课程节选

So by the time it came, more like, by the time I came to meet this random project that was pretty well change where it's making that, you know In terms of managing this whole process, nothing.

因此，当创造Facebook的念头产生的时候,我已经准备充分并且能够实现它了，但我从未想过关于规划整个过程的事。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选

It's a time of technological innovation, tremendous technological innovation, so much technological change that half the time it frightened people.

这还是个技术革新的时代,空前的技术革新,如此多的技术涌现,以至于人们有时候是对其感到恐惧的

耶鲁公开课 - 美国内战与重建课程节选

And so, if you rewind the tape and play it again over and over and over again, each time you set things up the very same way they must move or transform or change or end up in the very same state.

所以,如果你将一盘磁带,反反复复地播放,每次你播放的内容,从头到尾的起承转合一定是,绝对一致的

耶鲁公开课 - 死亡课程节选