It was pure luck finding him.

找到他完全是侥幸。

It was pure luck that he was home when we called.

非常幸运，我们打电话时他在家里。

People happen to find something but I don't think it's pure luck.

人们碰巧发现某种东西，但是我认为这不纯属运气。

That is pure luck, because my accuracy is no better than a tenth of a second.

这是纯靠运气，因为我的准确度不会，比0。1秒高。

Well, for one thing, they both ought to have been fatal and weren't, although that was pure luck.

第一，两次本来都该致命的，却没有致命，尽管这纯粹是运气。