Back then, sports and watching movies were the students' favorite times.

那时候，学生们最喜欢运动和看电影。

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Back then, however, the AU did not exist.

然而，在那时候，非盟还不存在。

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The sun was considerably less bright back then.

那时的太阳要暗得多。

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Back then,there was much hope that humans would return soon and make a home on Earth's only natural satellite.

VOA: special.2010.04.28

We have to--what we've seen recently-- we had more government intervention back then in the mortgage industry.

我们最近看到了,我们不得不让政府,更多地来干预抵押贷款行业

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It came out back then you know,

然后就变成现在这个样子了，

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Because I heard some song I used to hear back then, a long time ago.

NPR: 'BPP' Jukebox: Peter, Bjorn and John Soloist

Although the cast of characters was different back then, the plot was strikingly similar.

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Scientists say the climate back then was also considerably warmer than it is today.

BBC: Scientists call for action to tackle CO2 levels