He didn't really know the answer — it was just a lucky guess.

他并非真知道答案——那不过是个侥幸的猜测。

youdao

He's just a really great guy, and I feel really lucky.

他是一个非常棒的家伙，我感觉非常幸运。

youdao

Birds do it, killer whales do it, and if you happen to work in construction and are really lucky, you might just see a frog do it.

鸟类会唱歌，杀人鲸会唱歌，如果你在工地里上班，也许会幸运地听到青蛙也能唱歌。

youdao

But part of the process of being systematic is not assuming that I'm going to get a lucky guess. But not even thinking really hard at this point. But just pruning the search space.

但是系统化的过程是不允许,假设我做出了,一个幸运的猜测的,而是逐步缩小搜索空间。

麻省理工公开课 - 计算机科学及编程导论课程节选

The long trend in favour of value made lots of managers look smart, when they may really just have been lucky.

ECONOMIST: Looking for growth stocks when there is not much growth

And so, in the interests of journalistic inquiry, I sent myself on a mission to Topshop to determine whether the aforementioned females had just gotten lucky or whether these days one can really expect to find clothes that one might truly want to wear.

WSJ: Tina Gaudoin on Style: How to Wear Topshop Past 25