英帝国在19世纪曾昌盛一时。

The British Empire flourished in the 19th century.

《新英汉大辞典》

这种做法曾确保了我们过去的繁荣，也将确保我们在这个新世纪的昌盛。

That is what has ensured our prosperity in the past. And that is what will ensure our prosperity in this new century as well.

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