The 1960s and early 1970s were a time of change and turbulence.

20世纪60年代和70年代初期是个变革和动荡的年代。

《柯林斯英汉双解大词典》

Spring is a time of change, birth and rebirth.

春天是一个改变，新生和再生的时节。

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I am going to talk about issues which affect all our lives at a time of change for both our nations.

我将探讨一些在这个变化的时代影响我们两国全体民众生活的问题。

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The Industrial Revolution of the eighteen and nineteen hundreds was a time of great change for the world.

VOA: special.2011.04.26

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

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。

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The consultation on the bill - which calls for Wales to have fewer universities "with greater critical mass" - comes at a time of change in higher education.

BBC: Learned Society concerns about control of universities

And in a time of change, he has two other very important qualities: an insatiable curiosity to understand the world around him, and a willingness to hear other views, even those who disagree with him.

CNN: Clinton: Time again to choose a more perfect union

It was a time of change.

WHITEHOUSE: President Obama Speaks at Barnard College Commencement Ceremony | The White House