The study was conducted over a period of decades.
这项研究时长超过数十年。
I believe that over a period of decades newspapers have become a habit rather than a function.
我相信，在这几十年中，人们已经将读报变成了一种习惯，而不是再注重它应有的作用。
The Gan River Basin in Jiangxi Province is an example of planning for several projects to be constructed over a period of decades.
以江西赣江流域为例，已规划在今后几十年内建设多个项目。
College tuition has also grown faster than the rate of inflation for more than two decades, including a 6% increase in 2009 — a period when overall prices fell.
大学学费在过去二十多年间也以超过通胀速度的步伐增长着，其中2009年时上涨了6%，这还是在一个整体物价都下跌的时期。
The it in most large organizations has grown over a period of years or even decades - and it shows.
在过去的几年甚至是数十年间，许多大型机构中的IT部门成长起来。
Not all founders can become great CEOs, but most of the great companies in our industry were run by a founder for a long period of time, often decades, and we believe that pattern will continue.
他们指出：“尽管并非所有的创始人都能成为杰出的CEO，但大多数科技界的杰出公司都在创始人的领导下运营了很长一段时间，往往长达数十年，而且我们相信这种模式还会持续下去。
Many people worried that the overhang of debt, and the depressed state of the economy, would cause a prolonged period of deflation, as experienced by Japan over the past two decades.
许多人担忧，背负着高额债务并且经济状况不景气，这些会引发长期的通货紧缩，如同日本在过去20多年所经历的状况一般。
After a period of study and field test for some decades, this technique is gradually matured and substantial results are obtained.
利用放射性方法勘探油气藏，经历了数十年反复试验与研究，日趋成熟，效果显著。
After a period of study and field test for some decades, this technique is gradually matured and substantial results are obtained.
利用放射性方法勘探油气藏，经历了数十年反复试验与研究，日趋成熟，效果显著。
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