我经历了一个矢量的量变。

I experience a vector quantity.

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这就是矢量，这就是矢量的，表示方法。

This is a vector and that will be our representation of vectors.

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来看看位置矢量的改变。

And, we look at how the position vector changes.

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But I know when I multiply a vector by a number, I get a vector in the same direction.

但是我所知道的是当矢量乘以一个常数,我会得到一个同方向的矢量

耶鲁公开课 - 基础物理课程节选

The proper way to draw a vector is to draw an arrow that's got a beginning and it's got an end.

画矢量的正确方法是,画一个有起点和终点的箭头

耶鲁公开课 - 基础物理课程节选

The beauty of that is now we have discovered a notion of what it means to multiply a vector by a number.

现在最美妙的就是我们就已经知道,数字乘以矢量的意义

耶鲁公开课 - 基础物理课程节选