All right, and initially, well, maybe initially, momentum just to be simple I'm going to start false momentum equal to false.

好了，首先，为了简单起见，我会让,先等于。

麻省理工公开课 - 计算机科学及编程导论课程节选

Just for sake of argument, we'll assume it's about there, and I do the same thing.

为了方便起见,我们假定就在这里，重复之前做的。

麻省理工公开课 - 计算机科学及编程导论课程节选

Let's talk about velocity just for completeness.

为了完整起见，我们接下来要讲速度。

麻省理工公开课 - 固态化学导论课程节选