Past three decades have witnessed the evolution of the computer.
过去的三十年见证了计算机的发展。
The percentage of retirement-age people in the labor force has doubled over the past three decades.
过去三十年来，退休年龄人口在劳动力中的比例翻了一番。
Over the past three decades, the industry has made some efforts to improve the quality of its offerings.
在过去的三十年里，这个行业为了提高其产品的质量做了一些努力。
Over the past three decades the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
Over the past three decades, the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
In the past three decades their Numbers have doubled.
在过去30年中，他们的人数翻了一番。
Cassandra has had a tough assignment during the past three decades.
预言之神在过去的30年里任务很重。
That would roughly match global emissions over the past three decades.
这个数字大致相当于过去30年中的全球排放量。
That has been the story of parts of the Third World over the past three decades.
这已经在过去的三十年间在部分第三世界国家一再上演。
But in the past three decades this subtle musical voice has grown quieter and quieter.
但在过去的三十年中，这种不可思议的美妙音乐趋于销声匿迹——直到现在。
China's dramatic progress in poverty reduction over the past three decades is well known.
中国过去三十年来在减贫方面取得的巨大成功广为人知。
CSIS has played an active in Indonesia's intellectual journey over the past three decades.
CSIS在印尼过去30年的知识旅程中发挥了积极作用。
Four other federal inquiries held over the past three decades have failed to halt the decline.
在过去三十年里，其他四次联邦调查都无法阻止这个下降趋势。
But in the past three decades this subtle musical voice has grown quieter and quieter. Until now.
但在过去的三十年中，这种不可思议的美妙音乐趋于销声匿迹——直到现在。
Over the past three decades, these handy, "disposable" items were produced in extraordinary quantities.
在过去的三十年中，这些便利的，“一次性的”物品的数量令人吃惊。
Nearly all the gains that wage earners made over the past three decades have gone to paying for health care.
工薪阶层收入在过去的30年里几乎都花在医疗上。
HIV is one of the world's leading infectious killers, claiming more than 25 million lives over the past three decades.
艾滋病毒是全世界主要的传染病杀手之一，过去30多年来已造成2500多万人死亡。
Of the other 12 best rookies in the past three decades, all but two are either in the Hall of Fame or well on their way.
过去30年里最好的12名新秀，除了两人都进入了名人堂或正在路上。
More than 30 new human infectious diseases have emerged over the past three decades, most of them originating in the animal world.
过去三十年出现了30多种新型人类传染病，其中大部分源自动物界。
Yet the past three decades of experience suggest that this upward migration, even to, say, 40 percent, will be slow and difficult.
然而，过去30年的经验告诉我们，大学总体毕业率向上提升哪怕说涨到40%都是很缓慢、很困难的事情。
To make matters worse, the country’s oil industry, its fiscal cash-cow for the past three decades, is declining swiftly (see chart).
更惨的是墨西哥石油业正在迅速衰退，石油业过去三十年曾是墨西哥的最大财源（参见附表）。
But in the past three decades scientists have discovered that even the youngest children know more than we would ever have thought possible.
但是在过去的三十年中，科学家们逐渐发现，即使是最小的儿童，他们的思考能力也远远在我们原来所认为的水平之上。
Over the past three decades, the world has, on average, been growing richer. People have, on average, been enjoying longer and healthier lives.
在过去的三十年里，平均说来，世界变得越来越富，人们均能享受到更长寿更健康的生活。
Yet the pace of depredation has picked up rapidly over the past three decades, as tourist visits have increased 14-fold to over 160, 000 a year.
在过去的30年里，随着旅客人数增长了14倍到达每年16万人次，破坏的步伐也迅速加快了。
Yet the pace of depredation has picked up rapidly over the past three decades, as tourist visits have increased 14-fold to over 160, 000 a year.
在过去的30年里，随着旅客人数增长了14倍到达每年16万人次，破坏的步伐也迅速加快了。
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