I heard about it through a friend of a friend.

我通过朋友的朋友听到这事的。

《牛津词典》

I got the job through a friend.

我通过一位朋友得到这份工作。

youdao

There is nothing better than a girl finding out something good about you through a friend.

没有什么东西会比女生通过她的朋友发觉你的优点来的更好了。

youdao

She met her first husband through a family friend.

VOA: special.2010.08.08

I heard it through a friend.

我通过一个朋友听说的。

热门兼职 - SpeakingMax英语口语达人

And it's of course possible to say, well, just imagine a friend that you would want to talk through all eternity to. But the whole point is, I can't imagine what that would be like.

当然可以说，想象一个你想与之,永远长谈的朋友，但问题是，我无法想象那种情景。

耶鲁公开课 - 死亡课程节选

He heard of Fuchs through a friend and hunted him down at the Beverly Hills Hotel.

FORBES: The Un-PC

Always drawn to music, he discovered turntables in high school through a friend's brother who was a DJ.

CNN: DJ rocks despite hearing loss

I'm all for networking for getting a job whether that's mentioning a name or through a friend of a friend.

BBC: Networking: Does everybody need to schmooze to get on?