Trackers, which are ongoing projects that look at trends or customer satisfaction over a long period of time.

一个正在进行的项目——“追踪者”，在研究很长一段时期内的趋势或客户满意度。

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Diabetes is caused by a group of metabolic disorders in which there are high blood sugar levels over a long period of time.

糖尿病是由一组代谢紊乱引起的，代谢紊乱后，血糖水平长期偏高。

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Smoking a lot of cigarettes can harm and even kill over a long period of time.

长期大量吸烟会危害身体健康，甚至导致死亡。

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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

So, the process of developing a vaccine occurred over a long period of time.

疫苗的发展经历了很长一段时间

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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。

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And there are ways to spread that out over a long period of time.

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Day to day performance over a long period is the only reliable predictor of future results.

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My guess: Over a long period his strategy will be good for an incremental half a point a year.

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