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》

He built up the business over a period of ten years.

他用了十年时间把这个企业创建起来。

《牛津词典》

The bank depreciates PCs over a period of five years.

这家银行把个人计算机分五年折旧。

《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

The little insects were crawling around, the plants were there. And come back and look at it, over a period of weeks, and see what's changing.

我可以看到昆虫爬来爬去，还看到有些植物，几个星期后，再来看，看看发生了什么变化。

普林斯顿公开课 - 人性课程节选

And you have pretty good ideas of what these mortgages behave like over a period of time.

你就能知道,这些新增贷款情况如何了,这需要一段时间。

斯坦福公开课 - 经济学课程节选

Penney would make him 15 to 20 times his investment over a period of years.

FORBES: With J.C. Penney Fiasco, Bill Ackman's Year Looks Messy

In addition, any reforms would likely be phased in over a period of years.

FORBES: This May Be The Ideal Time To Reform The Mortgage Interest Deduction

Over a period of fourteen years, Dijkstra depicted a Bosnian refugee assimilating into Dutch society.

FORBES: How Rineke Dijkstra Transforms Trite Subjects Into Profoundly Revealing Photographs