They sang songs to keep their spirits up.

他们唱歌以保持高昂的情绪。

《牛津词典》

Though it's not easy, we should always keep our spirits up for it can give us courage to face difficulties.

虽然这并不容易，但我们应该始终保持精神振奋，因为这能够让我们有勇气面对困难。

youdao

I wish you enough happiness to keep your spirits up.

我希望你有足够的幸福使你情绪激昂。

youdao

The purpose of writing and performing satires like "The Last Cyclist" was to keep up the spirits of dehumanized, starving camp residents.

WSJ: Review: 'The Last Cyclist' is an affecting fable

Company founder Fowler says the slogans were started a year ago as a parody of the British wartime slogan "Keep Calm and Carry On, " which was intended to encourage Britons to keep up their spirits.

CNN: Company removes 'rape' shirt listed on Amazon

And she is happy to play their game, since it helps keep her spirits up.

CNN: CRISIS COMES HOME