在过去的五十年里，我们的期望已经改变了。

And our expectations have changed in the last fifty years.

youdao

在过去的五十年中，产生了许多关于如何这样做的理论。

In the last fifty years, there have been a lot of theories generated about how to do this.

youdao

在过去的五十年里，人们估计地球的人口承受能力从少于十亿到多于一万亿，但不可能所有人的估计都正确。

In the last half century, people have estimated human carrying capacities for the earth that have ranged from less than one billion to more than a trillion. They can't all be right.

youdao

Over the last five, ten years there's been some work done on this.

在过去五，十年里,有人做了一些有关笑的研究。

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And it's changed a bit over the last five to ten years. And now it's been gentrified.

在过去的五到十年里，这儿有了一些小变化，现在这儿改善得不错。

这里不危险 - SpeakingMax英语口语达人