Buck never allowed himself to be bullied into doing anything that went against his principles.

巴克从来不因受胁迫而做任何违背自己原则的事。

It's not just a matter of principle.

这不仅仅是个原则问题。

a violation of the basic principles of Marxism.

对马克思主义基本原理的一种违背。

The doctrine was based on three fundamental principles.

该学说建立于三个基本原理之上。 。

These people lack all understanding of scientific principles.

这些人缺乏对科学原理的全面理解。

the principles of quantum theory.

量子论的原理。

I agree with it in principle but I doubt if it will happen in practice.

我原则上是同意它的，但我怀疑在实践中它是否是可行的。

Even assuming this to be in principle possible, it will not be achieved soon.

即使假定这在理论上是可能的，它也不会很快实现。

He would vote against it on principle.

他会依据原则投票反对它。