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来不及了

before it's too late

before it's too late 可以拿来就用，而且一般不直接翻译为“在为时已晚之前”

可以根据上下语境翻译为：

在还来得及的时候

再晚就来不及了

不然就太晚啦

...

Buy now before it's too late.

欲购从速，勿失良机。

We must find a way to resolve these problems before it's too late.

我们必须找到一个办法去解决这些问题,不然就太晚了。