我原则上同意你的声明，但在某些细节上我有不同的意见。
I agree with your statement in principle but I disagree on some details.
我生平是个利己的人，虽然只在实践而非原则上如此。
I have been a selfish being all my life, in practice, though not in principle.
董事会原则上同意这个项目。
The board of directors approved the project in principle.
