A policeman had stumbled across a gang of youths.

警察偶然碰上一群结帮青年。

I stumbled across an app.

我偶然发现一个应用程序。

He stumbled across the answer after years of research.

经过几年的研究他无意中发现了答案.

I stumbled across this idea early in my career, and didn't even realize it.

早在我参加工作之初，我就听说过这个说法，当时我并不明白其中的道理。

Lisa stumbled across a movie clip in which the male star looked like Jason.

莉萨是在一个很偶然的机会，通过一段视频片断发现片中的男主角貌似简森。

We stumbled across the entrance to an underground passage, half covered by bushes.

我们无意中发现了一个被灌木丛遮盖了一半的地道入口.

Then, browsing online one night, I’d stumbled across the idea of renting a public-use cabin.

然后，有一天晚上我在网上搜索时，突然想到可以租一间公共小木屋。

And at 16, I stumbled across another opportunity, and I earned my first acting role in a film.

当我16岁时，我无意中遇到另一个机遇，得到了我的第一个电影角色。

Well as an avid subscriber to numerous blogs and forums I stumbled across the Logitech VX Nano.

那么作为一个狂热的用户众多博客和论坛，我碰到了罗技VX纳米偶然。

As we drew closer to the mouth of the river, we stumbled across the first roads we’d seen in months.

随着我们越来越靠近河流入海口，我们偶然发现了这几个月里我们曾见到的路。