But it has a property that when you add it to anything, you get the same vector.

但它有个性质,就是用它加任何矢量,你得到的都还是原矢量

耶鲁公开课 - 基础物理课程节选

It should have the property that when I add it to anybody, I get the same vector.

它也应该有这种性质,用它加任何矢量,得到的还是原矢量

耶鲁公开课 - 基础物理课程节选

But I can add to this some number, like 96, that'll still have the property that if you take two derivatives, you're going to get the same acceleration.

但是我可以在后面加上某个数,比如96,经过两次求导你仍会得到,同样的加速度

耶鲁公开课 - 基础物理课程节选