It comes from the fact that velocity is a vector and you can change your velocity vector by changing your direction.

其原理就是,速度是矢量,你可以通过改变方向来改变速度

耶鲁公开课 - 基础物理课程节选

The principles of insurance-- the fundamental powerhouse--is the principle of risk pooling.

保险的原理,其基本的动力...是风险汇聚原理

耶鲁公开课 - 金融市场课程节选