principia
n. 原理；基本原则
sp. 名词principium的复数形式.
例句
用作名词(n.)
- Newton's Principia, having explained orbits of heavenly bodies and more earthly things like the reason why apples fall to the ground, was hailed as the greatest insight of mankind.牛顿力学原理解释了天体绕轨道运行的原因以及宏观尺度的一些现象，比如苹果为什么会掉到地上。