Great changes have taken place in the past 50 years.
在过去的五十年里发生了巨大变化。
Only a few persons have been tried for treason in the past 50 years.
在过去的五十年里，只有少数人由于叛国罪被审问过。
Over the past 50 years more and more women have entered the work force.
在过去50年里越来越多的妇女加入到劳动力市场。
Over the past 50 years, women have made huge progress into academia and within it.
在过去的50年里，女性在学术领域有重大的进步。
Western people's average body size has increased by 50% over the past 250 years.
西方人的平均体型在过去250年增加了50%。
Western people's average body size has increased by 50% over the past 250 years.
西方人的平均体型在过去250年增加了50%。
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