These changes have occurred over a long time span.

这些变化经过了很长一段时间才形成。

《牛津词典》

Even a modest force, if sustained over a long time, would do.

如果它持续很长的时间的话，即使风力不大也可以做到。

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Their state is persistent and they can run over a long time.

其状态是持久性的，并且可以长时间地运行。

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Medical experts say small amounts of carbon monoxide over a long period of time can greatly harm an unborn baby.

VOA: special.2010.02.02

Stocks have paid 4% more a year over this incredibly long time period than short-term bonds.

股票在相当长的一段时间里,每年都比短期债券投资收益率,高出4个百分点。

耶鲁公开课 - 金融市场课程节选

or if it's over a long period of time and it's an ongoing situation that you want to get rid of.

或者是一件持续了很久的事，你特别想摆脱它。

I'm afraid of 课堂 - SpeakingMax英语口语达人

Foreign clubs turn to them because what they do has worked very well over a long time.

WSJ: Pellegrini's Background Looks Good For Soccer's Manchester City

This lends weight to the theory that a viable hybrid population was sustained by interbreeding over a long time.

ECONOMIST: Humans could have interbred with chimpanzees

This is one of the most valuable forms of scholarly originality, and it will make itself felt over a long time.

ECONOMIST: American history