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》

One advantage of pitfall traps is that they can be used to collect over a period of time with minimal maintenance and intervention.

陷阱的一个优点是可以在一段时间内用最少的维护和干预进行收集。

youdao

So this will play out over a period of time.

所以这要经过一段时间才会出现结果。

youdao

And over a period of time her grades fell completely.

VOA: special.2010.04.22

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

That's where you're just asked over a period of time, how often you eat this list of foods and you're given a very long list of foods.

正如同你们刚才问的,你多久吃一次这些食物,你有一个很长的食物列表

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

We recommend looking at the path of the economy over a period of time.

BBC: UK economy: GDP figures explained by ONS

We only - black Americans only got their full civil rights over a period of time.

NPR: Gault Book Details 'Africa's Renaissance'

"Over a period of time, Roy emerged as a stand-out candidate, " FA chairman David Bernstein said.

CNN: Hodgson appointed England manager