在过去的三十年里，英国发生了许多社会变化。
In the past thirty years many social changes have taken place in Britain.
过去的三十年见证了计算机的发展。
Past three decades have witnessed the evolution of the computer.
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 industry has made some efforts to improve the quality of its offerings.
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