So let's go to some actual real examples, which might come more in handy for this class.

下面让我们来看一些正确应用它的例子，这些例子在这个课堂上应该更容易一些。

麻省理工公开课 - 化学原理课程节选

I've got a definition of Cartesian point, I've got a definition of polar point.

让我们运行这个程序，来把应用这些定义。

麻省理工公开课 - 计算机科学及编程导论课程节选

if you don't want to use that, you can also derive it as we did every time, it should intuitively make sense how we got there. But the exams are pretty short, so we don't want you doing that every time, so we'll save the 2 minutes and give you the equations directly, but it's still important to know how to use them.

吸收的和发射的，如果你不想用公式,你也可以每次都向我们这样推导它,很直观的就能得到结果，但考试时间很短，我们不希望你们每次都推导,所以我们会直告诉你，让你节省2分钟，但知道如何应用它十分重要。

麻省理工公开课 - 化学原理课程节选