That's another way of saying maintaining velocity if it's not acted upon by a force.

这就是不受外力作用时,速度保持不变的另一种说法

耶鲁公开课 - 基础物理课程节选

What makes the law surprising is that if I only gave you half the law, namely every body will remain at rest if it's not acted upon by a force, you will say, "That's fine. I accept that, because here's something, you leave it there, it doesn't move.

这条定律妙就妙在,如果只看定律的前半段,即,如果物体不受外力作用,将保持静止状态,你肯定会觉得,"这没什么,我能理解,因为你把一个物体放在那里,自己肯定不会动

耶鲁公开课 - 基础物理课程节选

If they acted with a kind of mechanical necessity or even geometric necessity, they could not possibly be moral laws in that way.

如果这些法则有机械上,或者几何上的必须性的话，它们就不能被称作道德法则。

耶鲁公开课 - 政治哲学导论课程节选