Anyone can be wise after the event.

事后聪明谁都会。

《牛津词典》

If we had waited another week we could have bought the car more cheaply. Well, it's easy to be wise after the event.

如果再等一个星期，我们就可以更便宜地买到这辆车。不过，事后聪明总是容易的。

youdao

I shouldn't have put that extra spoonful of curry powder in this meal, but I suppose we can all be wise after the event.

我不应该在这顿饭里多放那一汤匙的咖喱粉，我想我们都是事后才明白的。

youdao

In any event, Mr Putin would be wise to keep him reasonably sweet, at least until after the election.

ECONOMIST: Boris Berezovsky, puppeteer or future victim?