It was a period of intense activity.

那是活动激烈的时期。

《牛津词典》

All these changes happened over a period of time.

所有这些变化都是在一段时间内发生的。

《牛津词典》

A period of unrest followed the president's resignation.

总统辞职之后有一段时期的动荡。

《牛津词典》

They used information gathered over a period of 20 years, until 2003, in the Framingham Heart Study.

VOA: special.2009.01.21

There was a period of time in which, although there were decent, chess-playing programs couldn't beat the best chess-playing humans.

尽管曾一度出现过,强劲的象棋程序,无法战胜顶级人类棋手的情形

耶鲁公开课 - 死亡课程节选

And it turns out that simply by counting the number of those spikes that occurs at a period of time.

随后，只要数一数在一定时间内,产生的尖峰脉冲的数量。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

If anything, we are in the middle of a period of increasingly good behaviour.

BBC: Is the teen rebel a dying breed?

There was a period of time when there wasn't much emphasis put on antibiotics.

NPR: Tracking a New Strain of Drug-Resistant Staph

But traders also suggested a correction was expected, following a period of rising markets.

BBC: Business