prin主要的 + cip拿取 -> 遵循最主要的事物 -> principle原理
principle:
n. 原理，原则；主义，道义；本质，本义；根源，源泉
We are still studying the working principle of this machine.
It's not just a matter of principle.
这不仅仅是个原则问题。
He would vote against it on principle.
他会依据原则投票反对它。
The principle behind it is very simple.
其中的原理十分简单。
She resigned over a matter of principle.
她因为原则问题而辞职。
He acted out of expediency, not principle.
他的行为是出于权宜之计而非原则。