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。

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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。

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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。

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She moved from butterflies to biochemistry, and her research over the past three decades has revolutionized the study of skin and skin diseases.

VOA: standard.2010.03.29

Britain's political life has been dominated for the past three decades by two parties - the Conservatives, now led by David Cameron, and Labor headed by current Prime Minister Gordon Brown.

VOA: standard.2010.04.23

Al is an instrument-rated private pilot and has played professional poker for the past three decades.

FORBES: Connect

Extreme poverty in the world has decreased considerably in the past three decades (figure 1).

FORBES: Move up http://i.forbesimg.com t Move down

Who besides Prince has built up such a durable pop songbook in the past three decades?

NEWYORKER: In New York