It's not just a matter of principle.

这不仅仅是个原则问题。

《柯林斯英汉双解大词典》

She resigned over a matter of principle.

她因为原则问题而辞职。

《牛津词典》

She refused to back down on a point of principle.

她在一个原则问题上拒绝让步。

《牛津词典》

The journalist says he is not a hero, but rather a man of principle.

VOA: standard.2009.09.15

Of course, that's not the useful application for it, it's more of a proof of principle, but it does show you that you can put it in for studies in any organisms.

当然，这不是很有用的应用，这仅仅是一个原理上的证明，但它告诉你你可以把它,放到研究任何生物体中。

麻省理工公开课 - 化学原理课程节选

The first sort of principle to me is clipping coupons.

我的第一个原则就是定期获得收益。

耶鲁公开课 - 金融市场课程节选

It is a matter of principle for me and something that responds to the public mood.

BBC: pay-offs to be capped at ?150,000

Ashcroft is considered a man of principle, admired for his deep moral and conservative convictions.

CNN: Carnahan's death shakes Democrats' Senate hopes

He is a man of principle, but his principles are neither unwavering nor always coherent.

ECONOMIST: John McCain