That bond multiple of 72 is just a drag on returns -what's the point?

债券72倍的收益看起来像在拖后腿,为什么还要投资于债券呢

耶鲁公开课 - 金融市场课程节选

But we all know that the reason things come to a halt when you push them is, there eventually is some friction or drag or something bringing them to rest.

但我们都知道,推完之后会停下来的原因就是,最后还是有某种摩擦或者拖拽,或者别的什么使得物体静止下来

耶鲁公开课 - 基础物理课程节选