What does it matter if I use his flat while he's away? What the eye doesn't see...!

我趁他外出时用他的公寓有什么关系呢？反正他又看不见！

《牛津词典》

What does it matter if I spent $100 on it—it's my money!

我花100元钱买这东西有什么关系—那是我的钱！

《牛津词典》

What does it matter, after all?

这到底有什么关系？

youdao

What does it matter what you say about somebody? It comes up all through his work that you never can pin anyone down.

VOA: standard.2009.12.17

You know that you're not going to decide the election, so what does it matter?

你知道你并不能决定选举结果,那投票还是不投票又有什么关系

耶鲁公开课 - 金融市场课程节选

But some ways you could ask, who cares? What does it matter?

但同时有些人会说,管它呢,这又有什么大不了的呢

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

What does it matter if rich individuals want to spend their enormous wealth on a club?

FORBES: Congratulations Your Takeover Bid For Arsenal Arrived A Decade Late

And if there are several competitors, what does it matter whether a few are fully foreign-owned?

ECONOMIST: British Energy proves a slow sell

Anyway, what does it matter?

NEWYORKER: Clara