In the past thirty years many social changes have taken place in Britain.
在过去的三十年里，英国发生了许多社会变化。
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。
In the past thirty years, the rate of divorce has risen dramatically.
在过去的三十年中，离婚率急速上升。
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。
Molecular distillation is a new separation technology developed in the past twenty or thirty years.
分子蒸馏是近二三十年才开发的一种新型分离技术。
Molecular distillation is a new separation technology developed in the past twenty or thirty years.
分子蒸馏是近二三十年才开发的一种新型分离技术。
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