These incidents took place during a time of intense social and political change in the United States.

VOA: special.2010.02.25

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

Senator Kerry said the time had come for a change in U.S.strategy toward Pakistan, with the aim of appealing to the hearts and minds of the Pakistani people.

VOA: standard.2009.05.04

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

"Whether or not they blame Karzai for that personally, I think that there is a general sense among significant parts of the population that it may be time for a change.

VOA: standard.2009.08.03

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

But in an economy that has lost jobs for 23 consecutive months, Hall noted that long-term unemployed continued to grow, rising by 293,000 to 5.9 million, with little change in the number of Americans employed part-time but seeking full-time work.

VOA: standard.2009.12.05

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

"Because it's happening so quickly, they haven't had time to adapt and change, if you imagine a climate changing over hundreds of thousands of years, bears and other animals would gradually move into other habitats,but because this is going to happen over decades, it will be too fast for them to adapt and look for other food sources,"

VOA: standard.2009.12.13

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

There have been fundamental changes through time that make the role of the central bank evolve and change through time.

试图保持系统的稳定,随着时间的发展，基本的改变发生,使得中央银行的角色演变。

耶鲁公开课 - 金融市场课程节选

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