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.
在过去的三十年里中国发生了巨大的变化。
Great changes have taken place in China in the last 30 years.
在过去的三十年里，中国发生了巨大的变化。
Over the past thirty years, great changes have happened in China.
在过去的三十年里，中国发生了巨大的变化。
Great changes have taken place in China during the past thirty years.
在过去的三十年里，中国发生了巨大的变化。
Great changes have taken place in China during the past thirty years.
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