Do you know where I can reach him?

你知道我在哪儿能跟他联系上吗？

《牛津词典》

"Do you know where she lives?"—"Sure."

“你知道她住在哪儿吗？”—“当然啦！”

《柯林斯英汉双解大词典》

I'm sorry to trouble you, but I wondered if by any chance you know where he is.

对不起打扰您了，我想问问您是否碰巧知道他在哪里。

《柯林斯英汉双解大词典》

And one day you want to go to the cemetery or something, you can't do it because you don't know where they are.

VOA: special.2010.02.01

See, if you know the Periodic Table then you know where elements are relative to one another.

如果你足够熟悉元素周期表,你可以知道,任何元素与另外元素的关系。

麻省理工公开课 - 固态化学导论课程节选

whereas here, it's a bit like a grid. You know where everything is.

然而，在这里，道路是规规整整的。你知道每个地方在哪里。

现代化的地方 - SpeakingMax英语口语达人

One easy precaution is to make sure you know where your oysters come from.

FORBES: A Giant Shucking Sound

His work is always clear and you know where he stands on the markets.

FORBES: 3 Excellent Elliott Wave Technical Analysts

Once you know where the site is, you can speculate about cures and strategies for therapy.

BBC: Eye disorder secret uncovered