Can you quote me an instance of when this happened?

你能否给我举例说明一下发生这事的情况？

《牛津词典》

If you ask a group of parents when this happened, most will say "around twelve months of age".

如果你问一群父母这是什么时候发生的，大多数人会说“大约12个月大”。

youdao

They were riding in a bus when this happened.

出事时，他们正坐在一辆公共汽车里。

youdao

When this happened, my friend would have to go in the hole.

VOA: special.2009.10.11

OK, if you look at that then, let's look at what happened when we ran this.

好的，如果再看一下那个，让我们看一下当我们执行这里时会发生什么。

麻省理工公开课 - 计算机科学及编程导论课程节选

And this is exactly what happened with Marsden who discovered that when he shot the alpha particles at the gold foil he detected something on his detector that click, click, click went a little bit faster.

而对于Marsden来说,就是这样，他发现当他用alpha粒子,轰击金箔的时候，探测器哒哒哒得更快了,他发现一分钟。

麻省理工公开课 - 化学原理课程节选

"He was at the top of his game when this happened, " said his grandfather, Jerome Muchnick.

NPR: Profiles Of 7 Nev. Army Depot Explosion Victims

The team and our guys have been completely accepted and when this happened, it just felt like family.

WSJ: Thunder, NBA donate to tornado relief efforts

When this happened, he ducked behind his father to keep from being noticed.

NEWYORKER: Town of Cats