As you build these kinds of simulations, or anything like this, you need to think through whether things should be multiplicative or additive.

正如你建立各种仿真程序，或者类似的仿真程序时，你应该去想一想,他们应该是用加法还是用乘法。

麻省理工公开课 - 计算机科学及编程导论课程节选

Same way that I have multiplication or division as a primitive, functions are going to give me, or somebody else who wrote them for me as part of a library, a new primitive that I'm going to be able to use.

我在用乘法或者除法当做原语,这些函数,或者别人写程序库中的函数,将会给我返回一个,我能使用的新原语。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I'm going to do it only using multiplication and addition and some simple tests. All right?

我只能用乘法和加法,以及一些小测试来解决这个问题？

麻省理工公开课 - 计算机科学及编程导论课程节选