一旦钱花光了，我们就不知道该怎么办了。

We didn't know how we would cope once the money had gone.

《牛津词典》

你曾经计划去一个令人兴奋的地方度假，但又担心要花太多钱或是你可能一旦到了那儿又会厌烦吗？

Have you ever wanted to go on vacation somewhere exciting but worried that it would cost too much or that you might be bored once you got there?

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这样，你很容易就可以知道你还有多少钱可以花在某项开支上，一旦钱花光了，你也能马上知道。

That way, you can easily track how much you have left for each of these expenses, and when you run out of money, you know it immediately.

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