I often look back upon the happy old days.

我经常回忆以前的快乐时光。

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The old often look back on the good old days.

老人常回忆以前的美好日子。

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They often look back on the days they spent together.

他们常回顾他们在一起度过的日子。

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They often look back on the days they spent together.

他们常回顾他们在一起度过的日子。

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