As night fell, our enthusiasm began to ebb away.

我们的热情随着夜晚的降临而渐渐低落下来。

《牛津词典》

You stammer some feeble responses by way of reply, feeling your strength ebb away until you find an excuse to leave.

你结结巴巴地作出一个无力的回应，同时感觉自己的力量在消退，直到你找到一个借口离开。

youdao

His enthusiasm began to ebb away.

他的热情开始消退。

youdao

Other sports feared that sponsors and audiences might ebb away if the drug-takers were not tackled.

ECONOMIST: The Tour de France is not dead yet

But the risk now is that the consensus for reform will ebb away.

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Yet Mr Singh's second government has offered no big policy reforms, while letting public support ebb away as voters grumble about graft and inflation.

ECONOMIST: Indian politics