but they are really for another course.

但其实是给另一门课程用的
So you should look at it and order it on your own.

所以你应该亲自去看看买一本回来
Okay, so I will now proceed to the actual subject matter for today.

现在我要继续了进入今天的重点部分
I told you, the way I'm going to teach any subject

我之前讲过我在上每一门课的时候
is going to start with the easiest example

都是从最简单的例子开始
and lull you into some kind of security

先打消你们的顾虑
and then slowly increase the difficulty.

然后渐渐加深难度
What's the next difficult thing?

那么更难的会是什么
The next difficult thing

更难的就是
is to consider motion in higher dimensions.

要考虑更高维的运动
How high do you want to go?

你们希望有多高的维度呢
For most of us, we can go up to three dimensions

对于大多数人来说我们最多可以考虑三维