Important lesson, so that there would be some predictability in the results and I would have some, if you will, smoke test for knowing whether or not I was getting, my code seemed to be working.

这很重要，因为这样我就可以预测,结果会是多少了，如果你愿意，我们可以做烟气试验,来看我的代码是否工作正常。

麻省理工公开课 - 计算机科学及编程导论课程节选

The advantage of introducing that guy is that if you like, I can now write an equation for the acceleration as a vector.

引入它的好处是,如果你愿意的话,我可以把加速度写成矢量形式

耶鲁公开课 - 基础物理课程节选