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》

But he has conceded a huge point of principle, and given Mr Obama something to work on.

不过，纳坦雅胡已经勉强承认一项重点的大原则，让欧巴马得以继续努力。

youdao

Though starch is arefined and relatively expensive starting point, his method is more efficientthan any of the alternatives that begin with plant matter. It is also a proofof principle.

尽管淀粉提纯物，耗费较高，但它比其他任何以植物为原料的方法都更高效，并且原理得到了证明。

youdao

These are actually all examples that we'll talk about in freshman chemistry at some point, as an example of a connection between a chemical principle we learn, and what we can know about how it functions.

作为联系一个我们,所学的化学原理,和我们能知道它，如何工作的例子。

麻省理工公开课 - 化学原理课程节选

It is a point of principle that is at stake here for developing countries.

BBC: Doha climate talks: US faces dilemma over final text

This is problematic for practical reasons, but also on a point of principle.

ECONOMIST: South Africa in black and white

The DUP's Christopher Stalford has countered that the Union flag campaign was a pan unionist effort on a point of principle.

BBC: Why has so much heat been generated now over flags?