Great changes have taken place in our school in the past two years.
在过去的两年里，我们学校发生了很大的变化。
Great changes have taken place in people's life in the last two decades.
在过去的二十年里，人们的生活发生了很大的改变。
Great changes have taken place in the town in the last two years.
这两年来，这个镇上发生了巨大的变化。
But during the last two thousand years there have been very great changes.
然而，在过去的两千年间，世界的变化非常显著。
But during the last two thousand years there have been very great changes.
然而，在过去的两千年间，世界的变化非常显著。
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