I experience a vector quantity.

我经历了一个矢量的量变。

youdao

So, speed, which is the scalar quantity is going to be just the magnitude of the vector, V.

因此，速度的大小即是,矢量V的模长。

youdao

A quantity which has both size and direction is called a vector.

既有大小，又有方向的量叫做向量。

youdao

There's one quantity that's going to come out the same, no matter who is looking at the vector.

但是也有一个量是始终不变的,不管是谁在观察这个矢量

耶鲁公开课 - 基础物理课程节选

We learned that a vector is a quantity that has a magnitude and a direction.

我们已经知道矢量是一个,既有大小又有方向的量

耶鲁公开课 - 基础物理课程节选